In such a case, density is a flow quantity, not a fluid property, and we have to determine its value as part of the problem. This will happen in flows traveling relatively fast (). Remember that the density of gases, like air, depend on pressure and temperature (by the ideal gas law), so the density of a gas may be sensitive to the local conditions.

This fact is very important in fluid mechanics! Notice that water is around 800 times denser than air. It is measured in units of mass/volume: default_unit(Density) kg m^-3įor example, the density of water at a reference temperature of 15.6 degrees C is Density(Water) Density = 999.0 kg m^-3Īnd for air at temperature of 15 degrees C and pressure of 1 atmosphere is Density(Air) Density = 1.225225682761773 kg m^-3 The density provides a measure of the amount of fluid material per unit volume. Let's start by discussing the basic properties of a fluid. For example, for pressure, default_unit(Pressure) Pa Fluid properties

In the examples below, we will show that the tools in these notebooks allow us to easily convert from one system to another.įor any quantity, we can see what the default units are by using default_unit. However, we also need to be familiar with Imperial (sometimes called 'English') units, which arise in many situations in engineering. We will generally focus on SI units, and these will be the default system for displaying quantities. Set up the module using ThermofluidQuantities We will also introduce some syntax we will use in this notebook and those that follow for dealing with units.

Flow quantities are characteristics of the flow of this fluid.

Fluid properties are properties of the material (the fluid).

In this notebook, we will discuss fluid properties and flow quantities, and the systems of units we use for them. Fluid properties, flow quantities, and units

Viscosity units mu