What is an incompressible substance?

What is an incompressible substance?

Most normal liquids and solids at normal pressures and temperature can be treated as incompressible substances provided that there are not phase changes occurring.

What is the expression used to determine the change in the enthalpy of an incompressible substance?

This comes from integration of the basic equation for evaluating enthalpy changes of an incompressible: dh=du+vdP. Then for constant pressure, dP=0 and so Δh=Δu=∫cdT.

What is the incompressible liquid approximation?

If the compressed liquid data are not available, the entropy of the compressed liquid can be approximated by the saturated liquid at the same temperature. Most solids and liquids can be approximated as incompressible substances. Absolute zero is used as the reference temperature.

What are compressible and incompressible substances?

Compressible fluids: are the fluids with variable density. Incompressible fluid: are the fluids with constant density. They could be liquids and gases. Although there is no such thing in reality as an incompressible fluid, we use this term where the change in density with pressure is so small as to be negligible.

Which substance is not compressible?

Solids are non-compressible and have constant volume and constant shape. Liquids are non-compressible and have constant volume but can change shape.

What are compressible and incompressible fluids?

The property of volume change is called compressibility and a fluid whose volume changes is called compressible fluid. On the other hand, an incompressible fluid is a fluid which is not compressed or expanded, and its volume is always constant. In reality, a rigorous incompressible fluid does not exist.

What is the example of incompressible fluid?

Example of incompressible fluid flow: The stream of water flowing at high speed from a garden hose pipe. Which tends to spread like a fountain when held vertically up, but tends to narrow down when held vertically down. The reason being volume flow rate of fluid remains constant.

Why is CP CV for incompressible substance?

From the general relationship of PV=mRT, where m=(PV/RT), since the mass, m, depends on Pressure, P, and volume V, then the specific Heat Capacity is also dependent on P and V. This is why the specific heat of liquids and gases depend on pressure and temperature. Cp and Cv are equal for incompressible substances.

What is enthalpy Thermodynamics?

enthalpy, the sum of the internal energy and the product of the pressure and volume of a thermodynamic system. In symbols, the enthalpy, H, equals the sum of the internal energy, E, and the product of the pressure, P, and volume, V, of the system: H = E + PV.

What is the compressed liquid assumption?

When compressed liquid tables are not available, one can make the assumption that the properties of the compressed liquid are the same as those of the saturated liquid at the same temperature.

What is difference between incompressible and compressible?

The main difference between compressible and incompressible fluid is that a force applied to a compressible fluid changes the density of a fluid whereas a force applied to an incompressible fluid does not change the density to a considerable degree.