Since water vapor is a gas, it depends on the Pressure and Temperature. The ideal gas law can be used for a given pressure and temperature. PV = nRT
Assuming 1 atmosphere pressure, and 100°C temperature (like the water had just boiled and turned to vapor, this can be computed. Note that water vapor can exist at a range of temperatures, not just above the boiling point. But at other temperatures, it will be mixed with the air (humidity).
1 pound = 453.59 grams. The Atomic Mass of H2O is 18 grams/mole, so 453.59 grams / (18 grams/mole) = 25.2 moles.
R is the ideal gas constant = 8.314472 Joule/Kelvin/mole. (SI units)
T of 100°C is 373 Kelvin. 1 atmosphere = 101325 pascals (SI unit equivalent to Joule/meter3).
Substituting these in and isolating V = 0.77129 cubic meters = 27.24 cubic feet.
1 pound of water at sea level can produce approximately 26.8 cubic feet of steam.
Based on the calculations in the related question (How many cubic feet of water vapor equals 1 pound?) using the Ideal Gas Law, 1 pound of water will be 27.24 cubic feet at 1 atmosphere pressure and 100°C (212°F).1 gallon of water is 8.3454 pounds, so at the temperature 212°F and 1 atmosphere pressure, 1 gallon will generate 227.33 cubic feet.
water equals liquid , water vapor equals gas and ice equals solid
280 gallons equals 37.43 cubic feet.
The measure of the actual amount of water vapor in the air is called absolute humidity. It is typically expressed in grams per cubic meter or grains per cubic foot.
One cubic meter equals one million cubic centimeter. It equals also one thousand liter. Accordingly, the volume of one liter of water equals 0.001 cubic meter.
456.8L of water equals 0.4568 cubic meters.
The amount of water vapor in the air is called the absolute humidity. It is usually expressed as grams of water vapor per cubic meter of air.
The amount of water vapor per cubic meter in the atmosphere as sea level is 30g/m3.
One migd equals 3810 cubic metre per day.
Air at 30°C can hold approximately 30 grams of water vapor per cubic meter.
It equals exactly that, 34 cubic kilometres of water!What do you actually want to know?