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Molar Specific Heat Gases

Reference data and engineering information about molar specific heat gases for thermodynamics applications.

molarspecificheatgasesData Table

Overview

Engineering reference data for Molar Specific Heat Gases in thermodynamics.

Key Formulas

First Law

ΔU=Q−W\Delta U = Q - W

Energy is conserved — heat added minus work done.

Ideal Gas Law

PV=nRTPV = nRT

Relates pressure, volume, and temperature of an ideal gas.

Heat Transfer

Q=mcΔTQ = mc\Delta T

Sensible heat transfer.

Carnot Efficiency

η=1−TC/TH\eta = 1 - T_C/T_H

Maximum efficiency between two temperatures.

Variables

SymbolDescriptionUnit
UUInternal energyJ
QQHeatJ
WWWorkJ
PPPressurePa
VVVolumem³
TTTemperatureK

Molar Specific Heat Data

11 rows
Approximate molar specific heats at constant volume for common gases at room temperature.
Gas
Specific Heat (C_v)(kcal/kmole·K)
Argon (Ar)3
Carbon monoxide (CO)5.02
Chlorine (Cl₂)6.01
Ethane (C₂H₆)10.3
Ether ((C₂H₅)₂O)30.8
Helium (He)3.02
Hydrogen (H₂)4.88
Mercury vapor (Hg)3
Nitrogen (N₂)6.97
Oxygen (O₂)4.99
Sulfur dioxide (SO₂)7.5

Source: engineeringtoolbox.com

Unit Conversions

The following conversions apply to the energy unit kilocalorie (kcal):

  • 1 kcal=4186.8 J1 \text{ kcal} = 4186.8 \text{ J}
  • 1 kcal=426.9 kp⋅m1 \text{ kcal} = 426.9 \text{ kp·m} (kilopond-meter)
  • 1 kcal=1.163×10−3 kWh1 \text{ kcal} = 1.163 \times 10^{-3} \text{ kWh}
  • 1 kcal=3.088 ft⋅lbf1 \text{ kcal} = 3.088 \text{ ft·lbf}
  • 1 kcal=3.9683 BTU1 \text{ kcal} = 3.9683 \text{ BTU}
  • 1 kcal=1000 cal1 \text{ kcal} = 1000 \text{ cal}

References

Source: engineeringtoolbox.com