Description: amount of gaseous substance in the liquid to be transported in the pump; Name: content of gas
Description: proportion of gaseous substance in the liquid to be pumped, either as a contaminant or as vapour from the main body of liquid; Name: gas content
Description: variable quantity, which is not influenced by the control but is introduced into the control system from outside with the aim of making the final controlled variable follow it in a given relationship; Name: command variable