Give some examples of materials that slow heat transfer. in each case state were the material is used?

Answer 1

Depends on what mode of heat transfer we are referring to!
The main modes: Conduction (through solids), Convection (through flowing matter), Radiation (the "lighter" the material, the easier the heat transfers).
Thus, we need to know for what mode we want to talk about!

Answer 2

Did you fall asleep during this lesson?
Don't worry, when you finally get a career, you'll be able to test this out experimentally on the coffee cups and fries boxes you be handling so adroitly. People will be stunned by your ability to put a milk shake meal together in under 10 minutes and almost get it right.

Answer 3

Styrofoam