An ideal gas is a hypothetical substance
that obeys the relation Pv = RT.
The ideal-gas relation closely
approximates the P-v-T behavior of real
gases at low densities.
At low pressures and high temperatures,
the density of a gas decreases and the gas
behaves like an ideal gas.
In the range of practical interest, many
familiar gases such as air, nitrogen,
oxygen, hydrogen, helium, argon, neon,
and krypton and even heavier gases such
as carbon dioxide can be treated as ideal
gases with negligible error.
Dense gases such as water vapor in steam
power plants and refrigerant vapor in
refrigerators, however, should not be
treated as ideal gases since they usually
exist at a state near saturation.
An ideal gas is a hypothetical substance
that obeys the relation Pv = RT.
The ideal-gas relation closely
approximates the P-v-T behavior of real
gases at low densities.
At low pressures and high temperatures,
the density of a gas decreases and the gas
behaves like an ideal gas.
In the range of practical interest, many
familiar gases such as air, nitrogen,
oxygen, hydrogen, helium, argon, neon,
and krypton and even heavier gases such
as carbon dioxide can be treated as ideal
gases with negligible error.
Dense gases such as water vapor in steam
power plants and refrigerant vapor in
refrigerators, however, should not be
treated as ideal gases since they usually
exist at a state near saturation.
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An ideal gas is a hypothetical substance
that obeys the relation Pv = RT.
The ideal-gas relation closely
approximates the P-v-T behavior of real
gases at low densities.
At low pressures and high temperatures,
the density of a gas decreases and the gas
behaves like an ideal gas.
In the range of practical interest, many
familiar gases such as air, nitrogen,
oxygen, hydrogen, helium, argon, neon,
and krypton and even heavier gases such
as carbon dioxide can be treated as ideal
gases with negligible error.
Dense gases such as water vapor in steam
power plants and refrigerant vapor in
refrigerators, however, should not be
treated as ideal gases since they usually
exist at a state near saturation.
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