# Chapter 6. Heat Definition: the transfer of energy (thermal) between objects that are at different temperatures. Definition: the transfer of energy (thermal)

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Chapter 6

Heat Definition: the transfer of energy (thermal) between objects that are at different temperatures. Definition: the transfer of energy (thermal) between objects that are at different temperatures. Energy is always transferred from the object with the higher temperature to the object with the lowest temperature Energy is always transferred from the object with the higher temperature to the object with the lowest temperature

When you put ice in water, are the cold ice molecules moving into the warm water or vice versa?

Thermal Equilibrium Thermal equilibrium is the point at which two objects reach the same temperature. Thermal equilibrium is the point at which two objects reach the same temperature.

Kick off during resource *give out packets *show powerpoint *go over pg 3&4 *go over calendar

Conduction The transfer of thermal energy from one substance to another through direct contact The transfer of thermal energy from one substance to another through direct contact Conductors – conduct thermal energy very well Conductors – conduct thermal energy very well Insulators – do not conduct thermal energy very well Insulators – do not conduct thermal energy very well

Give an example of something that uses conduction

Convection Transfer of thermal energy by the movement of a liquid or a gas Transfer of thermal energy by the movement of a liquid or a gas Circular motion is due to density differences – these are called convection currents Circular motion is due to density differences – these are called convection currents

Give an example of something that uses convection

Radiation Transfer of energy through matter or space as electromagnetic waves Transfer of energy through matter or space as electromagnetic waves

Give an example of something that uses radiation

Temperature Temperature is a measure of the average kinetic energy of particles in an object Temperature is a measure of the average kinetic energy of particles in an object The more kinetic energy, the higher the temperature The more kinetic energy, the higher the temperature

Measuring Temperature Thermometers measure temperature by thermal expansion – the increase in volume due to an increase in temperature Thermometers measure temperature by thermal expansion – the increase in volume due to an increase in temperature

Temperature Scales

Conversions

Absolute Zero Lowest temperature on the Kelvin scale Lowest temperature on the Kelvin scale It is the lowest temperature that can be achieved It is the lowest temperature that can be achieved All particle movement stops All particle movement stops

What do you think would happen to the world if the temperature went to absolute zero?

Temperature, Thermal Energy, and Heat

Matter and Heat States of Matter: solid, liquid, gas, and plasma States of Matter: solid, liquid, gas, and plasma

Changes of State The physical change that affects one or more physical properties of a substance without changing the identity of the substance The physical change that affects one or more physical properties of a substance without changing the identity of the substance Freezing – liquid to solid Freezing – liquid to solid Melting – solid to liquid Melting – solid to liquid vaporization – liquid to gas vaporization – liquid to gas Condensation – gas to liquid Condensation – gas to liquid Sublimation – solid to gas Sublimation – solid to gas

http://www.footprints-science.co.uk/states.htm

If water boils at 100 degrees Celsius and was left on the stove for a half hour, what would the temperature of the remaining water be? If water boils at 100 degrees Celsius and was left on the stove for a half hour, what would the temperature of the remaining water be? Why? Why?

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