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Thermal Energy, Expansion, and Contraction
Transcript of Thermal Energy, Expansion, and Contraction
The total amount of thermal energy in an object depends on its temperature and how many particles it contains
The joule is the unit used to measure thermal energy
Thermal energy can be created internaly with chemical, nuclear, and electrical reactions
It can be created or increased through external effects, such as; mechanical motion, radiation, and thermal conduction
Objects cannot contain heat because it is a process, object can only contain thermal energy
Heat and thermal energy are not the same
Heat is when thermal energy is transferred to another object
Thermal expansion is the expanding of matter when it is heated
An increase in volume of a material as its temperature is increased, is usually expressed as a fractional change in dimensions per unit temperature change.
When the material is a solid, thermal expansion is usually described in terms of change in length, height, or thickness.
As materials warm-up, the particle model of matter says that their particlesmove faster and spread apart
Thermal Contraction is when particles are cooled and an somthing contracts
This causes the volume to decrese while the temputure decreases
Thermal Contraction happens when something hot becomes cold
Some examples of Thermal contraction are balloons losing air when they are cold and Metal contracting when cooled
The top teapot has 2 oz. of water at 240ºC and the bottom teapot has 1 oz. at 240ºC. Which one has more thermal energy?
Particle Model of Matter
Particles of matter are made up of tiny particles.
Particles of matter are always moving.
The particles have spaces between them.
Adding heat to matter makes the particles move faster.
Dr. Michael J. Gourlay. (n.d.). Retrieved from http://www.energyeducation.tx.gov/energy/section_1/topics/forms_of_energy/thermal_energy.html
Elert, G. (n.d.). Retrieved from http://physics.info/expansion/
(n.d.). Retrieved from http://www.energyeducation.tx.gov/energy/section_1/topics/forms_of_energy/thermal_energy.html