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In order to answer your question, first I will briefly explain how an altimeter works.
An altimeter senses current atmospheric pressure, and converts it into an altitude reading. The lower the pressure, the higher altitude it will show.
In aviation, the pilot needs to select the correct altimeter setting before takeoff and during flight in order to get a correct reading. This is required because the pressure at sea level changes based on weather conditions. For example, if I parked my aircraft at an airport, then came back the next morning, my altimeter would give me a different reading than before because the weather conditions changed slightly overnight. I would then have to change the altimeter to the current local altimeter setting. The local altimeter setting is defined as the atmospheric pressure at Mean Sea Level (MSL) in inches of Mercury. Once the altimeter has the pressure at sea level, it can give an accurate reading of the current altitude. Air Traffic Control keeps pilots updated on the local altimeter settings as they fly. The other way to calibrate an altimeter, this only works on the ground, is to turn the pressure selector until the altimeter show the elevation of the airport you are currently at. At this point, the pressure shown is the local altimeter setting.
What else can I help you with?
What is the relationship between the temperature and dew point?
Dew point is the temperature at which the water vapor in the air condenses, then evaporates. The barometric or air pressure is independent from the dew point.
How a barometer can be used to measure the vapor pressure of a liquid?
A mercury thermometer, that is a barometer can be used to measure vapor pressure. Initially, a proper temperature must be recorded. Then the liquid should be injected into the mercury column. This new measurement subtracted from the original will yield the vapor pressure of a liquid.
How do you find the vapor pressure of water if the know temp of the water is 21 degrees C and the atmospheric pressure is 99.70 k Pa?
You can use a vapor pressure table or the Antoine equation to find the vapor pressure of water at 21 degrees C. The atmospheric pressure should not affect the calculation of the vapor pressure of water, as they are independent of each other in this context.
What is difference between vapor pressure and vapor density?
Vapor pressure is the pressure exerted by a vapor in equilibrium with its condensed phase (liquid or solid) at a given temperature. Vapor density, on the other hand, is the mass of a vapor per unit volume of air. In essence, vapor pressure relates to the equilibrium between the vapor and its condensed phase, while vapor density pertains to the mass of vapor in a given volume of air.
What happens to vapor pressure if sugar is added to a solution?
When you add a teaspoon of honey to water with vapor pressure, it will reduce the vapor pressure. The sugar in the honey leads to the pressure going down.
What does barometric pressure have to do with evaporation?
Above the surface of liquid water is a layer of water vapor. It has pressure. The atmosphere also has pressure. It pushes against the water vapor. The water vapor pushes against the atmosphere. It is called vapor pressure. It is related to temperature. When the vapor pressure equals barometric pressure, water boils. Normally this occurs at 100C or 212F. If you reduce the barometric pressure, you can reduce the boiling point of water. So when the barometric pressure is lower, the water vapor above the water has an easier time mixing with the atmosphere. As it mixes with the atmosphere, it is replaced by vapor from the water. It evaporates.
What is the relationship between the temperature and dew point?
Dew point is the temperature at which the water vapor in the air condenses, then evaporates. The barometric or air pressure is independent from the dew point.
What is the vapor pressure deficit formula used to calculate the difference between the actual vapor pressure and the saturation vapor pressure in the atmosphere?
The vapor pressure deficit formula is used to calculate the difference between the actual vapor pressure and the saturation vapor pressure in the atmosphere. It is calculated by subtracting the actual vapor pressure from the saturation vapor pressure.
What does the vapor pressure graph reveal about the relationship between temperature and vapor pressure?
The vapor pressure graph shows that as temperature increases, the vapor pressure also increases. This indicates a direct relationship between temperature and vapor pressure, where higher temperatures result in higher vapor pressures.
How can one calculate the vapor pressure deficit (VPD) using temperature and relative humidity?
To calculate the vapor pressure deficit (VPD), subtract the actual vapor pressure (e) from the saturation vapor pressure (es) at a given temperature. The actual vapor pressure can be calculated using the relative humidity (RH) and the saturation vapor pressure can be determined from the temperature. The formula is VPD es - e, where es saturation vapor pressure and e actual vapor pressure.
When should the boiling point of a liquid be recorded?
The boiling point of a liquid should be recorded when the liquid reaches a constant temperature at which it changes from a liquid to a gas (vapor) under a specific pressure. This usually occurs when the vapor pressure of the liquid equals the atmospheric pressure.
How does vapor pressure of water at 50 oC compare with its vapor pressure at 50 oC?
The saturated vapor pressure of water at 50 oC is 123,39 mm Hg.
Why water is unsuitable as a barometric liquid?
Water is unsuitable as a barometric liquid because it has a high vapor pressure, which can lead to evaporation or leakage in barometers. Additionally, water freezes at 0°C and boils at 100°C, which would limit the range of pressures that can be measured accurately. Finally, water can also corrode the equipment used in barometers.
What is the approximate vapor pressure when the gas condenses at 80oC?
The vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature. The vapor pressure depends on the temperature and the substance.
How can one determine the actual vapor pressure of a substance?
To determine the actual vapor pressure of a substance, one can use a device called a vapor pressure thermometer. This device measures the pressure exerted by the vapor of the substance at a specific temperature. By comparing the vapor pressure readings at different temperatures, one can determine the actual vapor pressure of the substance.
How a barometer can be used to measure the vapor pressure of a liquid?
A mercury thermometer, that is a barometer can be used to measure vapor pressure. Initially, a proper temperature must be recorded. Then the liquid should be injected into the mercury column. This new measurement subtracted from the original will yield the vapor pressure of a liquid.
What does the vapor pressure vs temperature graph reveal about the relationship between vapor pressure and temperature?
The vapor pressure vs temperature graph shows that as temperature increases, the vapor pressure also increases. This indicates that there is a direct relationship between vapor pressure and temperature, where higher temperatures lead to higher vapor pressures.
