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Air is essentially a mix of nitrogen and oxygen (they amount to about 99% of the air) at a pressure of one atmosphere, so that its behaviour is essentially that of a gas.
The gas fundamental law is that
P V =nR T
where
P is pressure
V is volume
n is related to the considered quantity (number of moles of the substance)
R is a constant (the so called gas constant)
T is temperature.
if you provide heat (you heat air) the second member increases since the temperature increases. In natural conditions the pressure remains constant at one atmosphere. Thus, since also the first member has to increase, the volume has to increase of a quantity
nRT/P
When you heat air at constant pressure it always expand!
Considering equal to Q the heat you give to your quantity of air and c the specific heat of air (that is the heat needed to rise a unit quantity of air of one degree Celtius), we have that the temperature increases is
T=c Q
and the expansion (increase in volume) of air turns to be
n R c Q /P
Just to make an example, let us increase of 3 degrees one cubic meter of air passing from 25 °C to 28°C, using parameters for air the increase of volume at pressure of one atmosphere turns to be 21 cm3
Wiki User
∙ 11y ago
Heated air will expand because the increase in temperature causes the air molecules to move faster and spread out, resulting in greater volume. Conversely, when air is cooled, it will contract as the decrease in temperature causes the air molecules to slow down and come closer together, leading to a smaller volume.
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Why does air contract and expand?
Air contracts and expands because of changes in temperature. When air is heated, its molecules gain energy and move faster, spreading out and causing the air to expand. Conversely, when air is cooled, its molecules lose energy and move slower, coming closer together and causing the air to contract.
What happen to the volume of the air as it is heated?
As air is heated, its volume typically expands. This happens because the heat increases the kinetic energy of the air molecules, causing them to move faster and spread out, which in turn leads to an increase in volume.
Why is it important to know air expands when heated?
It is important to know that air expands when heated because this principle is fundamental to understanding processes like convection, weather patterns, and the behavior of gases. It also informs the design of systems like engines, HVAC systems, and hot air balloons. Understanding how air expands when heated helps us predict and control these phenomena in various applications.
Does the air in a hot air balloon increase or decrease its density?
The air in a hot air balloon decreases in density when it is heated. As the air inside the balloon is heated, it expands and becomes less dense compared to the surrounding air, creating lift.
Does Air expand when its is heated?
Yes, when air is heated, it expands because the particles gain energy and move farther apart, increasing its volume. This expansion causes the air to become less dense and rise.
Does matter contract or expand when heated?
Matter expands when it is heated.
Why do marshmellows puff?
air expands when heated
What happens to air's volume when it is heated?
It expands.
When matter is heated does it contract?
No, when matter becomes heated it always expands, meanwhile when matter becomes cool it always contracts.
Why does air contract and expand?
Air contracts and expands because of changes in temperature. When air is heated, its molecules gain energy and move faster, spreading out and causing the air to expand. Conversely, when air is cooled, its molecules lose energy and move slower, coming closer together and causing the air to contract.
What will happen to the air in the air tight container when you heated it in the microwave oven?
the air in the container expands
What happen to the volume of the air as it is heated?
As air is heated, its volume typically expands. This happens because the heat increases the kinetic energy of the air molecules, causing them to move faster and spread out, which in turn leads to an increase in volume.
When air is heated it becomes what?
When air is heated, it expands and becomes less dense. This causes its molecules to move more quickly, increasing the air's temperature.
Why is it important to know air expands when heated?
It is important to know that air expands when heated because this principle is fundamental to understanding processes like convection, weather patterns, and the behavior of gases. It also informs the design of systems like engines, HVAC systems, and hot air balloons. Understanding how air expands when heated helps us predict and control these phenomena in various applications.
What happens when the air in a closed bottle is heated?
How an inflated balloon gets larger whwn heated?
The temparature was higher and it caused more air pressure
Does warm air contract?
No, warm air typically expands. As air is heated, its molecules gain energy and move further apart, causing the air to expand. Conversely, as air cools, its molecules lose energy and move closer together, causing the air to contract.
