| 单词 | vapor pressure |
| 例句 | They then linked the transactions with data on small and large wildfires along with data on drought stress accessed by a measure known as vapor pressure deficit. Wildfire, drought cause $11.2 billion in damage to private timberland in three Pacific states, study finds 2023-11-13T05:00:00Z "The one we used for this project has a lower melting point than table salt, low vapor pressure, and is organic." Scientists unveil fire-safe fuel 2023-09-28T04:00:00Z That’s in part because of heat’s effect on the vapor pressure deficit, which is basically a measure of how thirsty the atmosphere is, he said. Climate change boosts risk of explosive wildfire growth in California by 25%, study says 2023-09-04T04:00:00Z Scientists call this phenomenon the vapor pressure deficit. Some Surprising Places Are at Risk of Devastating Urban Wildfires like Maui’s 2023-08-23T04:00:00Z The study points to record-breaking temperatures that have decreased the relative humidity of the atmosphere, increasing the occurrence of "vapor pressure deficit." Climate Change Is Escalating California’s Wildfires 2023-05-31T04:00:00Z The researchers were then able to estimate that emissions from the major carbon producers contributed to 48% of the increase in the vapor pressure deficit observed over the last 120 years. Almost 40% of land burned by western wildfires can be traced to carbon emissions 2023-05-16T04:00:00Z “It’s going to result in an increase in vapor pressure deficit — things are going to get drier — and when you have extreme dryness and extreme heat, you’re going to see an increase in fire ignition.” One by one, L.A. firefighters on front lines succumb to extreme heat, adding new danger to job 2022-09-02T04:00:00Z Thus water evaporates and ice sublimates when their vapor pressures exceed the partial pressure of water vapor in the surrounding mixture of gases. College Physics for AP Courses 2015-08-12T00:00:00Z If the vapor pressure of pure water at 25 °C is 23.7 torr, what is the vapor pressure of the solution assuming ideal behavior? Chemistry 2019-02-14T00:00:00Z The analysis cites earlier research that estimated that 68 percent of the increase in vapor pressure deficit in the western United States between 1979 and 2020 is likely attributable to warming. Climate Change Is Escalating California’s Wildfires 2023-05-31T04:00:00Z Increasing humidity leads to reduced evaporation rates due to increased difference in water vapor pressure between leaf and atmosphere. Biology for AP Courses 2022-06-09T00:00:00Z “Then in places that are hot and moist compared to a desert … vapor pressure deficit goes down a little bit just as a function of the moisture that’s already in the air.” Wildfires are becoming more intense at night and lasting longer, study finds 2022-02-16T05:00:00Z The capacity of air to hold water vapor is based on vapor pressure of water. College Physics for AP Courses 2015-08-12T00:00:00Z Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one equivalent to that of the surrounding atmosphere. Chemistry 2019-02-14T00:00:00Z This gap, known as the vapor pressure deficit, is a good gauge of how dry and flammable grasses and pine needles are–much as a wet towel dries faster in hot, dry weather. Nights won’t save us from wildfires in a warming world 2022-02-16T05:00:00Z Increasing humidity leads to reduced evaporation rates due to decreased difference in water vapor pressure between leaf and soil. Biology for AP Courses 2022-06-09T00:00:00Z The vapor pressure deficit over a large area of the western U.S. that day was the highest value measured over the last 40 years, Fu said. Climate change is now the main driver of increasing wildfire weather, study finds 2021-11-01T04:00:00Z Then equilibrium has been achieved, and the vapor pressure is equal to the partial pressure of water in the container. College Physics for AP Courses 2015-08-12T00:00:00Z The liquid-vapor curve for the solution is located beneath the corresponding curve for the solvent, depicting the vapor pressure lowering, ΔP, that results from the dissolution of nonvolatile solute. Chemistry 2019-02-14T00:00:00Z The vapor pressure deficit, a metric that indicates how intensely a fire can burn, is also at record high levels. World's largest trees under siege from California wildfire as sequoias face new perils 2021-09-16T04:00:00Z Changes in water vapor pressure cause less oxygen to enter the air in the lungs. Biology for AP Courses 2022-06-09T00:00:00Z “So when we consider the weather pattern that happened during those days, we only can explain about half of the above-normal vapor pressure deficit value,” she said. Climate change is now the main driver of increasing wildfire weather, study finds 2021-11-01T04:00:00Z Table 13.5 gives representative values of water vapor pressure over a range of temperatures. College Physics for AP Courses 2015-08-12T00:00:00Z The vapor pressure of a liquid decreases as the strength of its intermolecular forces increases. Chemistry 2019-02-14T00:00:00Z The night air’s drying power, or vapor pressure deficit, has risen sharply in the past 40 years — as much as 50 percent above the previous average in the 1980s in the southern Sierra Nevada. Fires are growing worse at night 2021-08-06T04:00:00Z Increasing humidity leads to reduced evaporation rates due to decreased difference in water vapor pressure between leaf and atmosphere. Biology for AP Courses 2022-06-09T00:00:00Z The study, published this week in the Proceedings of the National Academy of Sciences, looks at what’s known as the vapor pressure deficit, which basically describes how thirsty the atmosphere is, Fu said. Climate change is now the main driver of increasing wildfire weather, study finds 2021-11-01T04:00:00Z If the partial pressure is less than the vapor pressure, then evaporation will take place, as humidity is less than 100%. College Physics for AP Courses 2015-08-12T00:00:00Z Ice has a small vapor pressure, and some ice molecules form gas and escape from the ice crystals. Chemistry 2019-02-14T00:00:00Z According to Abatzoglou, human-caused climate change is accelerating the rate that vegetation dries, through increases in both temperature and the vapor pressure deficit, a measure of atmospheric dryness. Western wildfires: An ‘unprecedented’ climate change fueled event, experts say 2020-09-11T04:00:00Z Increasing humidity leads to increased evaporation rates due to decreased difference in water vapor pressure between leaf and atmosphere. Biology for AP Courses 2022-06-09T00:00:00Z They used a machine learning approach to compare recent vapor pressure deficit values with those observed in the past during similar weather patterns. Climate change is now the main driver of increasing wildfire weather, study finds 2021-11-01T04:00:00Z If the partial pressure is greater than the vapor pressure, condensation takes place. College Physics for AP Courses 2015-08-12T00:00:00Z Both form homogeneous solutions; their boiling point elevations are the same, as are their lowering of vapor pressures. Chemistry 2019-02-14T00:00:00Z Over the past 30 days, the West has seen its highest vapor pressure deficit readings in the last 40 years for this time of year. Western wildfires: An ‘unprecedented’ climate change fueled event, experts say 2020-09-11T04:00:00Z Washington Gov. Jay Inslee signed a bill into law Thursday that requires a lower vapor pressure limit for crude shipped by rail than the industry standard and North Dakota requires. North Dakota to sue Washington state over new oil train rule 2019-05-10T04:00:00Z The bill awaiting Gov. Jay Inslee’s signature requires a lower vapor pressure limit for crude shipped by rail than either North Dakota requirements or industry standards. North Dakota, Washington state at odds over oil train rules 2019-04-30T04:00:00Z The saturation vapor density can be determined from the vapor pressure for a given temperature. College Physics for AP Courses 2015-08-12T00:00:00Z Elemental deuterium and tritium have lower vapor pressure than ordinary hydrogen. Chemistry 2019-02-14T00:00:00Z The Washington Senate voted last month to mandate a lower vapor pressure limit for Bakken crude shipped through the state by rail, aiming to limit fiery derailments. North Dakota decries Washington’s oil train safety bill 2019-04-01T04:00:00Z Companies must remove the most volatile gases from Bakken crude oil to ensure vapor pressure doesn’t exceed 13.7 pounds per square inch. North Dakota regulators may amend oil conditioning rules 2018-11-15T05:00:00Z EPA waived through Sept. 15 rules on federal Reid vapor pressure requirements and through Sept. 30 rules on reformulated gasoline and the blending of reformulated gasoline blendstock. U.S. waives gasoline rules in Virginia, Georgia as Florence nears 2018-09-12T04:00:00Z Sublimation occurs because the equilibrium vapor pressure of solids is not zero. College Physics for AP Courses 2015-08-12T00:00:00Z Relatively strong intermolecular attractive forces will serve to impede vaporization as well as favoring “recapture” of gas-phase molecules when they collide with the liquid surface, resulting in a relatively low vapor pressure. Chemistry 2019-02-14T00:00:00Z Measurements of the vapor pressure of cubic ice and their implications for atmospheric ice clouds. Role of stacking disorder in ice nucleation 2017-11-07T05:00:00Z The commission is looking into reducing how often companies submit vapor pressure tests to regulators. North Dakota regulators may amend oil conditioning rules 2018-11-15T05:00:00Z It allows the suspension of some vapor pressure regulations for petroleum products being trucked in some areas across the state. Harvey prompts Gov. Snyder to declare state energy emergency 2017-09-01T04:00:00Z The vapor pressure of a substance depends on both the substance and its temperature—an increase in temperature increases the vapor pressure. College Physics for AP Courses 2015-08-12T00:00:00Z Weak intermolecular attractions present less of a barrier to vaporization, and a reduced likelihood of gas recapture, yielding relatively high vapor pressures. Chemistry 2019-02-14T00:00:00Z Some parts of the U.S. block certain blends during the summer months based on vapor pressure, but lower percentage blends such as E10, or 10 percent ethanol, have a waiver from the EPA. South Dakota farmers fear uncertain ethanol future 2017-04-15T04:00:00Z But the Dakota Resource Council says current rules are insufficient and the vapor pressure threshold should be set higher. North Dakota regulators may amend oil conditioning rules 2018-11-15T05:00:00Z Many U.S. refiners are also still preparing summer-grade gasoline, which costs more to make because it has a lower vapor pressure to prevent smog, she said. Average U.S. gas prices rose 8 cents in three weeks: Lundberg 2016-04-10T04:00:00Z They depend only on the vapor pressure of water. College Physics for AP Courses 2015-08-12T00:00:00Z The following example illustrates this dependence of vapor pressure on intermolecular attractive forces. Chemistry 2019-02-14T00:00:00Z On Tuesday, Mr. Schneiderman petitioned the federal Pipeline and Hazardous Materials Safety Administration to impose a cap on the vapor pressure of crude transported by train. New York Wants Oil Companies to Treat Oil Shipped on Trains 2015-12-02T05:00:00Z When condensed ether was poured over the fabric covering the higher bulb, the bulb cooled, and the vaporized ether within condensed, lowering vapor pressure in the bulb. Al Roker: The Tragic History of Early Weather Forecasting 2015-08-04T04:00:00Z Limiting vapor pressure to 13.7 psi in transit would require an operator to bring it to "something well below that" at the loading point, Sutton said. North Dakota's new oil train safety checks seen missing risks 2015-03-31T04:00:00Z At 100% humidity, the partial pressure is equal to the vapor pressure, and no more water can enter the vapor phase. College Physics for AP Courses 2015-08-12T00:00:00Z Explain these vapor pressures in terms of types and extents of IMFs for these alcohols: Chemistry 2019-02-14T00:00:00Z Emmerling declined to comment on why the Transportation Department did not include vapor pressure controls in its oil train proposal last year. Exclusive: White House mulled, then balked at curbing explosive gas on oil trains 2015-03-05T05:00:00Z Officials did not test vapor pressure on crude oil samples that led to fines against Hess Corp, Marathon Oil Corp and Whiting Petroleum Corp early this month. U.S. lawmakers to question oil-by-rail safety; tank cars a concern 2014-02-26T06:12:28Z Meanwhile, the American Petroleum Institute, a leading voice for the oil industry, is lobbying lawmakers to resist federal vapor pressure benchmarks and last week urged lawmakers to oppose "a national volatility standard." North Dakota's new oil train safety checks seen missing risks 2015-03-31T04:00:00Z The capacity of air to “hold” water vapor is determined by the vapor pressure of water and has nothing to do with the properties of air. College Physics for AP Courses 2015-08-12T00:00:00Z As temperature increases, the vapor pressure of a liquid also increases due to the increased average KE of its molecules. Chemistry 2019-02-14T00:00:00Z When Transportation Department and White House officials convened on this issue last summer, the administration decided to back North Dakota's plan to limit vapor pressure - a measure that was just taking shape at the time. Exclusive: White House mulled, then balked at curbing explosive gas on oil trains 2015-03-05T05:00:00Z Canadian pipeline peer Enbridge Inc is currently analyzing whether to change its vapor pressure testing method, a spokesman said. Exclusive: TransCanada toughens pipeline pressure limits for gassy crude 2014-01-31T13:29:12Z Excess temperature, solar radiation, and high vapor pressure deficit are major greenhouse concerns during the summer season. New Technology Improves Greenhouse, Plant Microclimates 2011-01-03T15:53:00Z The purpose of the humidity diagram is to enable the dry-kiln operator to determine quickly the humidity conditions and vapor pressure, as well as the changes which take place with changes of temperature. Seasoning of Wood The boiling point of a liquid is the temperature at which its equilibrium vapor pressure is equal to the pressure exerted on the liquid by its gaseous surroundings. Chemistry 2019-02-14T00:00:00Z High vapor pressures also contribute to difficulty in handling. U.S. Patent 4,293,314: Gelled Fuel-Air Explosive October 6, 1981. Light ends are volatile gases with low molecular weights, measured by carbon numbers, with a lower number signifying higher volatility and higher vapor pressure. Exclusive: TransCanada toughens pipeline pressure limits for gassy crude 2014-01-31T13:29:12Z Now, the rates of evaporation from any moist object is determined by two factors: vapor pressure and the rate of movement of the air past the object. The Dollar Hen They are proportional to vapor pressures, not to density, and, therefore, may be followed from one temperature to another with correctness. Seasoning of Wood Figure 10.24 shows the variation in vapor pressure with temperature for several different substances. Chemistry 2019-02-14T00:00:00Z The escape of more molecules per unit of time and the greater average speed of the molecules that escape both contribute to the higher vapor pressure. Chemistry 2019-02-14T00:00:00Z The curve BC in Figure 10.31 is the plot of vapor pressure versus temperature as described in the previous module of this chapter. Chemistry 2019-02-14T00:00:00Z Now, the vapor pressure undergoes all manner of changes with the passing of storm centers and the changes of prevailing winds. The Dollar Hen Relative humidity is simply the ratio of the actual vapor pressure present in a given space to the vapor pressure when the space is saturated with vapor at the given temperature. Seasoning of Wood While this interpretation is useful, it does not account for several important aspects of the colligative nature of vapor pressure lowering. Chemistry 2019-02-14T00:00:00Z Identify two common observations indicating some liquids have sufficient vapor pressures to noticeably evaporate? Chemistry 2019-02-14T00:00:00Z What is the relationship between the intermolecular forces in a liquid and its vapor pressure? Chemistry 2019-02-14T00:00:00Z But there is a general tendency for vapor pressure to increase with increase in outside temperature. The Dollar Hen These colligative properties include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure. Chemistry 2019-02-14T00:00:00Z Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Chemistry 2019-02-14T00:00:00Z Dissolving a nonvolatile substance in a volatile liquid results in a lowering of the liquid’s vapor pressure. Chemistry 2019-02-14T00:00:00Z They include changes in the vapor pressure, boiling point, and freezing point of the solvent in the solution. Chemistry 2019-02-14T00:00:00Z This device simply gives a greater evaporating surface to the water and hence a greater addition to the vapor pressure. The Dollar Hen Considering the definition of boiling point, plots of vapor pressure versus temperature represent how the boiling point of the liquid varies with pressure. Chemistry 2019-02-14T00:00:00Z At a temperature of 60 °C, the vapor pressure of water is 0.196 atm. Chemistry 2019-02-14T00:00:00Z At a temperature of 374 °C, the vapor pressure has risen to 218 atm, and any further increase in temperature results in the disappearance of the boundary between liquid and vapor phases. Chemistry 2019-02-14T00:00:00Z Identify two common observations indicating some solids, such as dry ice and mothballs, have vapor pressures sufficient to sublime? Chemistry 2019-02-14T00:00:00Z In the present-day incubator of either type we are wholly at the mercy of sudden climatic changes of vapor pressure. The Dollar Hen The vapor pressure of methanol, CH3OH, is 94 torr at 20 °C. The vapor pressure of ethanol, C2H5OH, is 44 torr at the same temperature. Chemistry 2019-02-14T00:00:00Z Liquid bromine has a high vapor pressure, and the reddish vapor is readily visible in Figure 18.60. Chemistry 2019-02-14T00:00:00Z Now he does not know the amount of vapor pressure and has no way of finding it out. The Dollar Hen The following are averages of the monthly vapor pressures at four points in which we are interested: Month Buffalo, N.Y. The Dollar Hen In such a cellar the vapor pressure of the air is not only greater but is less influenced by the shifting vapor pressure of the outside air. The Dollar Hen Nearness to a coast does not mean uniform vapor pressure, for with wind alternating from sea to land, it means just the opposite. The Dollar Hen When this equilibrium is reached, the vapor pressure of the gas is constant, although the vaporization and condensation processes continue. Chemistry 2019-02-14T00:00:00Z Let me first repeat that evaporation increases with increased air currents and with decreased vapor pressure. The Dollar Hen The tendency for the rate of airflow to vary is diminished when a cellar is used for an incubator room, but the cellar does not materially remedy the climatic variation in vapor pressure. The Dollar Hen The ordinary incubator thermostat gives the necessary impulse for the control of the temperature dampers, while the instrument above referred to is used for the vapor pressure control. The Dollar Hen The result of the moisture pan with a given current of air is that the vapor pressure is increased a definite amount, but by no means is it regulated or made uniform. The Dollar Hen Its overall IMFs are the largest of these four substances, which means its vaporization rate will be the slowest and, consequently, its vapor pressure the lowest. Chemistry 2019-02-14T00:00:00Z The subject not being clearly understood and no means being available for vapor pressure determinations, the system results in confusion and disputes. The Dollar Hen Fifth: As a fifth in such a series I might mention again the Egyptian machine with the uniform vapor pressure of the climate and the three chicks exchanged for four eggs. The Dollar Hen In order to regulate this evaporation, he must know and be able to control both vapor pressure and the currents of air that strike the eggs. The Dollar Hen Weather Bureau should, in the hands of an expert, give results making possible measurements accurate to two or three per cent. of relative humidity or forty to sixty units of vapor pressure. The Dollar Hen |
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