Convert kilograms of air to liters at any pressure and temperature. 1 kg of air fills 773 L at 0 °C and 1 atm, and much less inside a compressed cylinder.
Conditions
−50 °C0 °C100 °C
Z
Gas volume at these conditions
—
Live gas chamber
At 0 °C, 1 atm
Gas density
Moles
Compression vs 1 atm
At 1 atm
Your gas
Bars use a log scale so very high compression stays visible.
How KG to Liters Air Works?
KG to Liters Air works by turning the mass of air into moles with the molar mass of dry air (M = 28.965 g/mol) and applying the ideal gas law V = Z · n · R · T ÷ P. The calculator sets the gas to air and accepts pressure in bar, atm or psi and temperature in °C or °F.
Mass1 kg air
→
÷ 28.965 g/mol34.52 mol
→
Volume at STP773.8 L
1 kg of air = 34.52 mol × 22.414 L/mol = 773.8 L at 0 °C (32 °F) and 1 atm.
4 steps to use KG to Liters Air
Enter the mass of air in kilograms (kg), grams (g) or pounds (lb).
Set the absolute pressure, including 1 atm for open air or 200 bar for a scuba cylinder.
Set the air temperature in °C or °F.
Read the air volume in liters (L) and cubic meters (m³).
KG to Liters Air Formula
The KG to Liters Air formula is V = Z · (m ÷ 28.965) · R · T ÷ P. The formula has 5 variables:
V (volume) is the air volume in liters (L).
m (mass) is the air mass in grams (g).
R (gas constant) is 8.314 J/(mol·K).
T (temperature) is the absolute temperature in kelvin (K).
P (pressure) is the absolute pressure in pascals (Pa).
V = Z · (m ÷ 28.965) · R · T ÷ P
3 worked examples of the KG to Liters Air formula
1 kg of air at 0 °C and 1 atm: 773.8 L.
1 kg of air at 20 °C and 1 atm: 830.5 L.
1 kg of air at 200 bar and 15 °C: 4.14 L.
The density of air is 1.293 kg/m³ (1.293 g/L) at 0 °C and 1 atm and 1.204 kg/m³ at 20 °C and 1 atm.
KG to Liters Air Conversion Table
The KG to Liters Air conversion table lists the volume of 1 kg of air at 6 pressures and 2 temperatures.
Pressure
0 °C (32 °F)
20 °C (68 °F)
1 atm (1.013 bar)
773.83 L
830.49 L
2 bar
392.04 L
420.75 L
10 bar
78.41 L
84.15 L
50 bar
15.68 L
16.83 L
200 bar
3.92 L
4.21 L
300 bar
2.61 L
2.8 L
What Is KG to Liters Air?
KG to Liters Air is a mass-to-volume conversion that turns the mass of air in kilograms (kg) into the volume of air in liters (L) at a set pressure and temperature.
Air is a gas mix of 78.08% nitrogen (N₂), 20.95% oxygen (O₂), 0.93% argon (Ar) and 0.04% carbon dioxide (CO₂) by volume. Dry air has a molar mass of 28.965 g/mol.
1 kg of air fills 773 L at 0 °C and 1 atm and 830 L at 20 °C and 1 atm.
1 liter of air weighs 1.29 g at 0 °C and 1 atm.
1 m³ of air weighs 1.20 kg (2.65 lb) at 20 °C and 1 atm.
What Are the Uses of KG to Liters Air?
There are 4 main uses of KG to Liters Air: scuba cylinders, compressor sizing, HVAC airflow and tyre and tank filling.
Scuba cylinders: A 12 L scuba cylinder at 200 bar holds 2.9 kg of air.
Compressor sizing: Compressors rated in liters per minute (L/min) of free air convert to kg/min for process air.
HVAC airflow: Ventilation of 1,000 m³/h of air moves 1,204 kg/h at 20 °C.
Tyre and tank filling: A 50 L tank at 10 bar holds 0.6 kg of air.
Frequently Asked Questions
How many liters is 1 kg of air?
1 kg of air is 773 L at 0 °C and 1 atm (STP), and 830 L at 20 °C and 1 atm.
How much does 1 liter of air weigh?
1 liter of air weighs 1.29 g at 0 °C and 1 atm, and 1.20 g at 20 °C and 1 atm.
How many liters is 1 kg of air at 200 bar?
1 kg of air is 4.1 L at 200 bar and 15 °C, using a compressibility factor (Z) of 1.