The definition of porous is a material that is able to easily absorb fluids or allow liquid to pass through. A material through which liquid can easily pass is an example of a porous material. porous. porous. Admitting the passage of gas or liquid through pores or interstices.
Plasma is one of the four basic states of matter among solid, liquid, and gas. Thermal plasmas reach higher temperatures as well as reach thermal equilibrium. hot plasmas are created by heating a gas until electrons have reach an energy that break free from the atoms.
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. In the context of mechanics problems, we are usually interested in the role thermal energy plays in ensuring conservation of energy. Almost every transfer of energy that takes place in real-world physical systems does so with efficiency less than 100% and results in some thermal energy. This energy is usually in the form of low-level thermal energy. Here, low-level means that the temperature associated with the thermal energy is close to that of the environment. It is only possible to extract work when there is a temperature difference, so low-level thermal energy represents 'the end of the road' of energy transfer.