HEL give me an example of thermal energy and describe what is happening at particle level.

Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.

Explanation:

will this help you

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.