Is there any difference between cubic feet and standard cubic feet?

Question

Is there any difference between cubic feet and standard cubic feet?

Answer 1

A standard cubic foot (abbreviated as scf) is a measure of quantity of gas, equal to a cubic foot of volume at 60 degrees Fahrenheit

A standard cubic foot is thus not a unit of volume but of quantity, and the conversion to normal cubic metres is not the same as converting cubic feet to cubic metres

Answer 2

Standard cubic feet is at atmospheric pressure and temp. Cubic feet is not.

So, 1 ft^3 of air at 4 atmospheres of pressure (absolute) is equivalent to 4 scf.