Both can flow.
What the hell are you talking about? Of course grass is a solid. Is it a liquid? Is it a gas? Is it a plasma?Jesus christ.
When a substance changes from a liquid to a gas energy is absorbed. When a substance changes from a gas to a liquid energy is released.
A substance that flows is called "liquid".
plasma
A non-liquid substance is a material that is not in a liquid state, such as a solid or a gas.
A gas or a liquid.
Gas
When a solid, liquid , or gas is dissolved in another substance, the result is a solution.
The energy needed to change a substance from a liquid to a gas is called the enthalpy (or heat) of vaporization.
A liquid changing to a gas is known as vaporization.
Substance at Vapour - Liquid phase equilibrium can exist as both liquid or gas at the same time.
Convection and conduction.