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Thermal Energy and Heat (Calorie is equal to the amount of energy needed…
Thermal Energy and Heat
Thermal Energy: The total kinetic energy of all particles in a substance. In the SI system, thermal energy is measured in Joules (J)
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Heat: is the energy transferred from an object that has higher temperature to an object at a lower temperature
When two objects at different temperatures come into the contact, energy is always transferred from the object that has the lower temperature
Calorie is equal to the amount of energy needed to raise the temperature of 1 g of water by 1 degree c
Heat van also be measured in joules (J) because heat is a form of energy. One calorie is equal to 4.18 J
A thermometer measures the increase in temperature, which is used to calculate how much energy is released. This amount is the number of calories
Adding or removing heat from a substance will affect its temperature and thermal energy. Heat is not the same as thermal energy
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The kinetic theory of matter states the particles that make up matter move around at different speeds
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Convention: Transfer of energy as heat by the movement of a liquid or gas. In most substances, as temperature increases, the density of the liquid or gas decreases
Convention occurs when a cooler, denser mass of a gas or liquid replaces a warmer, less dense mass of a gas or liquid bushing it upward
Convection: When boil water in a pot the water moves in a roughly circular patterns because of convection. The motion is due to density differences that result from temperature differences. The motion is called convection current
Radiation: Transfer of energy by electromagnetic waves. Some examples of electromagnetic waves are visible light, microwaves, and infrared light.
Sun is the most significant source of radiation that you experience on a daily basis.Even you emit radiation and release energy.
When radiation is emitted from an object and then obsorbed by another the result is often transfer of heat. Like Conduction and Convection, radiation can transfer heat from warmer to coolr objects. It does differ from conduction and convection in a very significant way. It can be traveled through empty space, as it does when it moves from the sun to earth