# Why is CP bigger than CV explain in 2/3 sentences?

## Why is CP bigger than CV explain in 2/3 sentences?

The heat capacity at constant pressure CP is greater than the heat capacity at constant volume CV , because when heat is added at constant pressure, the substance expands and work. QV = CV T = U + W = U because no work is done. Therefore, dU = CV dT and CV = dU dT .

## What is CP and CV in physics?

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 the R constant in thermodynamics?

The value of R depends on the units involved, but is usually stated with S.I. units as: R = 8.314 J/mol·K. This means that for air, you can use the value R = 287 J/kg·K.

## Does R change with temperature?

1 Answer. One way to look at the gas constant, R, is the constant of proportionality between pressure x volume and particle count (n) x absolute temperature T. Changes in pressure, temperature, or number of particles can make a nearly ideal gas like Helium (for example) deviate from ideal gas law behavior.

## What is r equal to?

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.

## What is the value of R at STP?

The Gas Constant (R) If you use the first value of R, which is 0.082057 L atm mol-1K-1, your unit for pressure must be atm, for volume must be liter, for temperature must be Kelvin.

## What is the physical significance of R?

Dimensions. where P is pressure, V is volume, n is number of moles of a given substance, and T is temperature. The physical significance of R is work per degree per mole.

## What is the value of room temperature and pressure?

NIST uses a temperature of 20 °C (293.15 K, 68 °F) and an absolute pressure of 1 atm (14.696 psi, 101.325 kPa). This standard is also called normal temperature and pressure (abbreviated as NTP).