What is the equation for determining the pressure in a manometer, when it is assumed that the pressure being measured is a gas and there is liquid in a manometer? (i. e. what is the pressure made by a column of liquid of height l? )

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature