- #1
7bear
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Higher the temperature, lower is the air pressure.
Lower the temperature, higher is the air pressure.
Are they right? If yes, why?
Lower the temperature, higher is the air pressure.
Are they right? If yes, why?
cepheid said:In general, I think that this is correct. A warm air mass will rise and expand. When this is happening over you, the local atmospheric pressure is therefore lower. I'm guessing it's simply because you have a less dense air mass over you. Therefore it weighs less and exerts less pressure. Come to think of it, it's like suddenly having fewer air molecules per unit volume. Just as if this were happening in a container, the pressure would decrease.
Likewise, a cooler air mass will sink and contract, becoming more dense. I'm quite sure that when that happens in your area, it's referred to as a high pressure system.
Is my assessment correct?
7bear said:Higher the temperature, lower is the air pressure.
Lower the temperature, higher is the air pressure.
Are they right? If yes, why?
expscv said:is this in a test tube, or the whole world?
you should give more deatail , casue this will leads to several answers
cepheid said:Yeah, actually. I'm really confused about this after reading everyone's answers. I admit I must have been wrong, but what I'd like to know is what's meant by high pressure and low pressure weather systems.
Classroom explanations are kind of weird because they talk of an "air mass" being warmed, expanding, rising, and cooling. I'd also like to know: if we're surrounded by a sea of air, what differentiates one particular air mass, and how can it "expand" without displacing air around it?
The relationship between air pressure and temperature is known as the ideal gas law, which states that the product of pressure and volume is directly proportional to the absolute temperature of a gas. This means that as temperature increases, so does air pressure, and vice versa.
Temperature affects air pressure because it determines the amount of energy that air molecules have. When temperature increases, air molecules have more kinetic energy and move faster, causing them to collide with each other and the walls of their container with more force, resulting in an increase in air pressure.
Air pressure decreases with altitude because the higher you go in the atmosphere, the fewer air molecules there are above you. This means that there are fewer air molecules available to collide with each other and the walls of their container, resulting in a decrease in air pressure.
Air pressure is typically measured using a barometer, which can be either an aneroid or mercury type. In an aneroid barometer, a flexible metal box is used to measure the amount of air pressure exerted on it. In a mercury barometer, a column of mercury is used to measure the weight of air above it, which is directly related to air pressure.
The standard unit of measurement for air pressure is the Pascal (Pa), which is equivalent to one Newton per square meter. Other commonly used units include pounds per square inch (psi) and millibars (mb). In some cases, air pressure may also be measured in atmospheres (atm) or inches of mercury (inHg).