How Can Heat be Transferred?. Temperature and Heat What measures the temperature of matter? –Thermometer Temperature of matter is caused by particles.

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Presentation transcript:

How Can Heat be Transferred?

Temperature and Heat What measures the temperature of matter? –Thermometer Temperature of matter is caused by particles moving very quickly. The more energy they have the more they move. Experiment: Slowly move your hands against each other. Are your hands very warm? Now move your hands against each other rapidly. Which movement makes your hands warmer?

What’s the Matter? In solid matter the particles cannot move very far because they have no place to go. What do you think happens in liquid or gas matter? –In both types of matter the particles can move more rapidly releasing more energy. –Food for thought: Which takes longer to heat up in the microwave a potato or a glass of water?

Food for Thought The potato takes longer to heat up because it is made of solid matter. The particles cannot move as quickly through solid than liquids.

What is Heat? Heat is the transfer of energy. Think about a hot summer day and you decide to jump in a swimming pool to cool off. How do you feel when your body hits the water? Well, energy is moving from your body into the water.

How does heat travel? Convection: The movement of heat in liquids and gases from a warmer area to a cooler area. –Example: boiling water in a pot of water on a stove

Another type of heat transfer… Conduction: the movement of between two materials that are touching. –Example: A hot spoon in a bowl of spoon. The spoon is hot and it’s heat is transferred to the spoon.

Third type of heat transfer Radiation: the movement of heat without matter to carry it. –Example: The sun’s energy is release through heat (light), and it travels through space (not considered matter) to the earth.

Remember… Heat always moves from warmer matter to matter that is cooler. –Think about a hot cup of chocolate that has been out on the counter for 1 hours. What happens to the liquid?