Which one is greater for air CP or CV give reason?

cp is greater than CV because when gas is heated at constant volume,whole of the heat supplied is used to increase the temperature only. But when gas is heated at constant pressure,the heat supplied is used to increase both temperature and volume of gas.

Can CP ever be less than CV if so give an example?

Cp is always greater than Cv for the same temperature difference because: For Cp, i.e., heat capacity for constant pressure process, take for example piston cylinder arrangement. But for Cv, i.e., heat capacity for constant volume process, take for example insulated rigid container.

What is CP and CV?

In thermodynamics, the heat capacity ratio or ratio of specific heat capacities (Cp:Cv) is also known as the adiabatic index. It is the ratio of two specific heat capacities, Cp and Cv is given by: The Heat Capacity at Constant Pressure (Cp)/ Heat capacity at Constant Volume(Cv)

What is CP for ideal gas?

Specific Heats (Cv and Cp for Monatomic and Diatomic Gases) The molar specific heat of a gas at constant pressure (Cp) is the amount of heat required to raise the temperature of 1 mol of the gas by 1 °C at the constant pressure. Its value for monatomic ideal gas is 5R/2 and the value for diatomic ideal gas is 7R/2.

How do you calculate CP of gas?

Key PointsThe specific heat at constant volume for a gas is given as (∂U∂T)V=cv ( ∂ U ∂ T ) V = c v .The specific heat at constant pressure for an ideal gas is given as (∂H∂T)V=cp=cv+R ( ∂ H ∂ T ) V = c p = c v + R .

What is SI unit of R?

Therefore, we can write R as: And so, in SI base units: R = 8kg⋅m2⋅s−2⋅K−1⋅mol−1.

What is PV is equal to nRT?

In the formula P V = N R T {\displaystyle PV=NRT\,} : P is the pressure of the gas. In SI units, this is measured in Pascals, or Newtons of force per square meter of area. (“Standard atmospheric pressure at sea level” is about 101,000 Pascals, or 101 KiloPascals.

What is the constant R?

The gas constant R will appear in many contexts as this is a Universal constant that relates energy and temperature. A pressure times a volume is an energy. As such, you will also encounter the gas constant R in typical energy units of Joules. R=8.314Jmol−1K−1.

What are the 3 R values in chemistry?

The value of the gas constant ‘R’ depends on the units used for pressure, volume and temperature.R = 0.0821 liter·atm/mol·K.R = 8.3145 J/mol·K.R = 8.2057 m3·atm/mol·K.R = 62.3637 L·Torr/mol·K or L·mmHg/mol·K.

What is the value of R in kJ?

Gas Constant Values based on Energy Unitsg mol Kelving mol RankineJ8.kcal0.327kgf.m0.2kJ0.9158

Why is the universal gas constant R?

So why did Clapeyron choose the letter R for the con- stant in his gas law? …the more distant, as regards pressure and temperature, a gas is from its point of condensation the more correct will be the law [i. e. the more constant R].

Who discovered the universal gas constant?

Benoît Paul Émile Clapeyron

Does the universal gas constant change with temperature?

For ‘real’ gasses, the gas law no longer applies. Changes in pressure, temperature, or number of particles can make a nearly ideal gas like Helium (for example) deviate from ideal gas law behavior. The description of this non-ideality is not handled by changing the value of R.

What is R for water?

Specific gas constant of water vapor R_w = \frac{1000R}{M_w} = 461.52J/(kgK), where R = 8.3144621J/(molK) is the molar gas constant and M_w = /mol is the molecular weight of water vapor.

How do you use PV NRT?

6:09Suggested clip 120 secondsPV=nRT – Use the Ideal Gas Law – YouTubeYouTubeStart of suggested clipEnd of suggested clip