Moving molecules collide and meet. Moving molecules that's what makes heat. Some move fast. Some move slow. Check your thermometer if you want to know. Moving very slow, you think they might be old. Slow moving molecules are very very cold. Moving very fast, like it or not Fast moving molecules are hot. Moving molecules collide and meet. Moving molecules that's what makes heat. Some move fast. Some move slow. Check your thermometer if you want to know. Rub two sticks, try to make a fire. rub them even faster, make the temp go higher. Any kind of friction will make a little heat. Will slow you down in a box car meet. Mix two chemicals. If they give off heat, molecules in motion have increased their speed. Mix two chemicals. If the get cold, molecules in motion have slowed. Moving molecules collide and meet . Moving molecules that's what makes heat. Some move fast. Some move slow. Check your thermometer if you want to know. Put a thermometer under your tongue. 98.6 if your old or your young. Your body makes heat when you work or learn from the food you eat and the calories burned. Moving molecules collide and meet. Moving molecules that's what makes heat. Some move fast. Some move slow. Check your thermometer if you want to know.
