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Heat and temperature shit :/ - Coggle Diagram
Heat and temperature shit :/
Temperature
It is the measure of how hot an object is.
SI unit is Kelvin (K)
Other common units are
degree Celsius (oC)
degree Fahrenheit (oF)
Change in temperature is either
Losing thermal energy
Gaining thermal energy
Expansion and contraction in solids,liquids and gases
Solids
When something is heated, it expands and becomes
longer
bigger
Railway tracks: Expansion gaps are placed at regular intervals along the tracks so as to allow expansion in case of extreme hot weather. (the earth having fever :skull:)
Liquids
If earth overheats:
oceans expand and the sea levels rise, leading to coastal erosion.
loss of other marine life ( fish die noooooooo)
plankton cannot adapt and die
coral bleaching( coral ded)
Gases
They expand and contract alot more than liquids and gases.
Water pipes: When water pipes and oil pipelines can expand on hot days,causing them to burst. Hence, expansion bends are made in these pipes. This allows the pipes to expand without any damage.
Effects of expansion and contraction
Advantages:
bimetallic strip (two pieces of metal stick together, most common is iron and BRASS) <- brass is important
mostly made in
thermostat
Electric irons
Air conditioners.
Disadvantages and solutions
Expansion gaps
wires/ pipes
Heat transfer
Convection
transfer of heat energy from one place to another by the physical movement of a medium
Only in liquids and gases
Convection current in liquids
When a liquid is heated, it expands, becomes less dense and rises. The cooler liquid at the top is denser and therefore sinks to the bottom and in turn gets heated up. These changes in density give rise to convection currents.
Convection currents in gases:
The air above the candle heats up and expands. It becomes less dense and rises up the chimney above it. Cooler air, which includes the smoke from the smouldering paper, moves down the other chimney to take the place of the hotter air that has risen above the candle. This cooler air and smoke is then heated by the candle, becomes less dense, and rises up the chimney.
Radiation
transfer of heat from a hotter body to a cooler body WITHOUT the need for a medium
Conduction
transfer of heat energy from one place to another without the movement of the medium.
vibration of particles is stronger when heated
Works best in solids