Complex sentence: The constant 24.45 is the molar volume of an ideal gas at 25 ° C and 1 atmosphere: for different pressures and temperatures, this value needs to be recomputed.
Split into simpler sentences: The constant 24.45 is the number of liters in a mole of gas at 25 ° C and 1 atmosphere. For different pressures and temperatures, this value needs to be recomputed.