pm
absoluutne rõhk, mis toimib gaasi koguse mõõtmisel, absolute pressure at which the volume of the gas is measured, gas pressure in a meter to which the indicated volume of gas is related, absolute fluid pressure in a meter under flowing conditions to which the indicated volume of liquid is related, absoluutne vedeliku rõhk arvestis voolavates tingimustes, millega on seotud vedeliku mahu mõõdis