ABSTRACT
This chapter introduces the types of fluid used in thermofluid situations. It defines the hydrostatic pressure for a fluid having a constant density. The chapter discusses pressure-measuring devices such as the barometer and manometer. It introduces the non-flow energy equation for a closed thermofluid system undergoing a process. The chapter introduces the first law of thermodynamics for a closed system undergoing a cycle. Thermofluid relates to situations that can be modelled using a thermofluid system and analysed by means of 'thermofluid mechanics'. Thermofluid mechanics combines the two disciplines of thermodynamics and fluid mechanics. In order to analyse thermodynamic situations it is also essential to have a knowledge of the properties and behaviour of fluids, hence the inclusion of fluid mechanics with thermodynamics to form an integrated study of thermofluid mechanics. One of the significant developments that took place in the foundation of thermofluid mechanics occurred in the seventeenth century with the understanding of atmospheric pressure.
