Presentation on theme: "Cornell notes about heat and how heat transfers"— Presentation transcript:
1 Cornell notes about heat and how heat transfers Essential Question #1: What is heat and how does it differ from temperature?Essential Questions #2: What are the methods of heat transfer and how does each one work?
2 What is Heat?A form of energy that flows between two samples of matter because of the differences in temperature. Heat always flows from areas of HOT TO COLD.
3 What is the difference between heat and Temperature? Heat is the total amount of energy transferred in systems due to a difference in temperature, while temperature is a measure of how fast molecules are moving in a substance (how much heat is present). Thermal energy is related to temperature. A substance can have thermal energy with no heat (because particles in atoms are always moving and this is thermal energy)
4 3 methods of Heat Transfer: 1. Conduction- the transfer of heat from one molecule in a substance to another by means of DIRECT CONTACT of the molecules (occurs in solids).2. Convection- the transfer of heat in liquids or gases due to currents. These currents are caused by differences in density due to differences in temperature (creating up and down currents).3. Radiation- heat transfer that travels through space and can move THROUGH something.
6 Examples of each type of heat transfer CONDUCTION: -Touching a stove and being burned -Ice cooling down your hand -Boiling water by thrusting a red-hot piece of iron into it -when computer on for long time, when your feet touch hot sand, when you touch a generator, when you touch a light bulb that gives off heat Convection: when you turn on hot sink water boiling water hot spring water rising, warm air RADIATION: -Heat from the sun warming your face -Heat from a lightbulb (not direct contact) -Heat from a fire -Heat from anything else which is warmer than its surroundings.