the fractional expansion of matter (ie the expansion of the unit length, area or volume) per degree rise in the temperature. If the coefficients of linear, areal and cubical expansion of a substance are ?, ?, and ? respectively, ? is approximately twice, and ? three times, ?.
For the evaluation of the volume, coefficients of thermal expansion of 3*10-3 per degree Celsius for propane and propylene and 2*10-3 per degree Celsius for butane and butadiene shall be used instead of the exact values.
