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Chapter 17: Effects of heat and its transmission - Coggle Diagram
Chapter 17:
Effects of heat and its transmission
factors that affects rate of heat gain and loss
the surface area
the nature of the surface
color: black or white
texture: rough or smooth
temperature of the body
temperature difference between the surrounding and the body
how to explain convection questions
matter gains heat, becomes hot and expands. It becomes less dense and rises to the top
matter loses heat, becomes cool and contracts. It becomes denser and sinks to the bottom
uses of heat conductors and insulators
poor conductors: reduce heat transfer from one place to another
good conductors: when heat is needed to be transferred quickly from one place to another
what are the effects of heat?
contraction
objects lose heat and decrease in size
expansion
objects gain heat and increase in size
conduction
it is the transfer of heat through a material without the obvious movement of the medium itself
good conductors: metals such as aluminum, iron and steel
poor conductors: liquid, gases, and some solids such as wood, plastic and glass
what is the SI unit of temperature?
kelvin (K)
what is absolute zero?
it is 0 Kelvin and it is the lowest temperature possible anywhere where all particles stop moving
Radiation
it is the transfer of heat without the need for a medium
eg. of medium: solid liquid or gas
convection
it is the transfer of heat from one place to another by the movement of the medium itself
eg. liquid and gas
absorption and emission of radiation
emission: loss of heat
absorption: heat gain
unusual behavior of water
As water is cooled to 4°C, it contracts like other liquids.
As it is further cooled to below 4°C to 0°C, water expands