$A$ substance has no mass. Can one consider it as matter?

State whether the following statement is true or false:
The movement of tiny particles in a gas or liquid is called the Tyndall effect.

State whether the following statement is true or false:
Solids are very rigid and cannot flow from one place to another.

Why does water as steam cause severe burns,whereas water as ice has a cooling effect? Explain.

Name the state of matter in which
$(i)$ layers of particles can slip and slide over one another easily.
$(ii)$ particles just move around randomly because of very weak force of attraction.

State whether the following statement is true or false:
Latent heat means the heat which can be seen easily.