Heat Transfer Flashcards
What is heat and what is temperature?
Heat is the sum of all the kinetic energy in an object. It is measured in joules and is passed on from a hot object to a cold object. Temperature is the average of all the energy in an object.
What is Thermal energy? How is it connected to kinetic energy?
Atoms are always moving, hence they have kinetic energy. The thermometer can measure this kinetic energy. The more energy the higher the temperature. Absolute zero is the lowest temperature anything can ever be which is -273 degrees C. Everything that has mass and its temperature is above absolute zero has thermal energy.
What are the 3 types of heat transfer? What is an insulator and what is a Conductor?
There are 3 types of heat transfer:
Conduction - Heat transfer between 2 solids
Convection - Heat transfer between 2 liquids (air counted as liquid)
Radiation - Heat transfer in small pockets.
An insulator is an object that slows heat transfer and a Conductor is an object that allows heat transfer.
What is the temperature scale? What is Celsius, Kelvin?
The thermometer has liquid mercury and when touches heat it moves and shows the temperature. The metric scale is Celsius and its based on the properties of water. it was created by a Swedish scientist.
Kelvin = Celsius + (-273.15)
Farhenheit = 1.8 C + 32 (1.8)
Celsius = 1.8(F - 32)
Thermal energy and mass
Thermal energy and mass are directly related. An object with more mass will have more energy and will take more time to cool down but if the object with more mass has more surface area exposed it will cool down faster.
What is Conduction?
Conduction is the transfer of thermal energy between particles of matter that are touching. Thermal energy is always transferred from particles of warmer matter to particles of cooler matter. When particles of warmer matter collide with particles of cooler matter they transfer heat.
What is convection?
Convection is heat transfer between two liquids. Air counts as a liquid. Ex: Boiling water, mixing water of two different temperatures
What is Radiation?
Radiation is is heat transfer by waves. It travels through air and It can also travel through water. Ex: Suns heat
