2. The Temperature-Volume Law
• A gas law that describes
how gases tend to expand
when heated.
• At a fixed pressure, the
volume of a gas is
proportional to the
temperature of the gas.
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3. A cylinder with a piston
and a gas is immersed in
water. A mass is placed
on top of the piston which
results in a pressure on
the gas. This mass is held
constant which means
that the pressure on the
gas is constant.
The Experiment
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4. Equation
V1 2 =T V2 1T
V = volume of gas T = temperature
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5. Importance
According to this law, the gases expand
on heating. Since the mass of gas remains
same, the number of molecules per unit
volume (density) decreases on heating. In
other words, hot air is less dense than cold
air. This enables the hot air balloons to rise
up by displacing the cooler air of the
atmosphere.
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