3.2
3.2
3.2.1
Some properties are very familiar, such as temperature and pressure. Later in this course we will introduce some other less common, but very useful thermodynamic properties, such as enthalpy and entropy.
Phase, Pure Substance
Extensive, Intensive and Independent Properties
Equilibrium
Identify some common Properties For a known mass, convert between Extensive and Intensive Properties
3.2.2
How often do you look at the weather forecast ? Whilst the forecast often seems incorrect, modern computer simulation has become increasingly more accurate.
An understanding of the variation in pressure and temperature in the atmosphere is critical for predicting future developments.
Have a look at this video, the terms ‘pressure’ and ‘temperature’ are commonly used, but what actually do they mean ?
3.2.3
But, have you ever thought, is one temperature and one pressure unique?
Are there different sorts of air that can have the same temperature and pressure?
3.2.4
In this unit we will consider the different physical forms that a substance may take and how they may be represented in terms of properties.
We will start by defining the phase of a substance. This will allow us to define a homogenous mixture which will then help us to introduce the concept of pure and simple substances. Followed by the introduction of thermodynamic properties and the state of a substance allowing us to explore the idea that the state depends upon thermodynamic properties.