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Heat and Temperature - Coggle Diagram
Heat and Temperature
Heat
Sources Of Heat
Things that produce heat
Main source
Sun
Fuels that produce heat when burnt
Petroleum
Natural gas
Oil
Wood
Coal
Sources of light is sources of heat
Examples
During daytime we feel hot
Caused by the sun
When Fuels burn
Coal
They give off
Heat
Light(in the form of fire)
Wood
When light bulbs are switched on
They give off
Heat
Light
Electrical appliances
Electric iron
Rice cooker
Water heater
Oven
Toaster
Introduction of Heat
Heat is a form of energy
Heat is not matter
Still can feel its effects
Sense of touch
Heat flow
An object
Gaining heat
Becomes hot
Losing heat
Becomes cold
Flow from a hotter to a colder object
Until both reach same temperature (Room temperature)
Two objects touch each other,heat flow takes place when both objects have different temperature
Factors that affect the speed at which objects gain or lose heat
Good and poor conductors of heat
Not all objects allows heat to pass through them in the same way
Good conductor of heat
Metals
Silver
Zinc
Copper
Aluminum
Iron
Gold
Steel
Allows heat to pass through them easily
Uses
make utensils in some electrical appliances
Bad conductor of heat
Does not allow heat to pass through them easily
Uses
Wool fur and feathers
3 more items...
Plastic
2 more items...
Examples
Rubber
Glass
Fabric
Wood
Air
Plastic
Situations in our daily lives
A metal spoon feel colder than a plastic spoon at the same temperature
Explanation
Metal are a good conductor of heat than plastic
Our hand loses heat faster when we touch metal spoon
Thickness
Thickness increase,heat flowing becomes slower,more time needed to transfer same amount of heat
Affect hows fast heat takes place
Effects of heat gain and heat loss
Can cause a change in temperature of things
Object gains heat
Temperature increases
Object loses heat
Temperature decreases
Graph can show changes in the temperature of an object
Caused by
Heat loss
Heat gain
Changes in state of matter
Object gains or loses heat
It changes in state
Object gains heat
It can change from
Solid to liquid
Melting
From liquid to gas
Boiling
Object loses heat
It can change from
Liquid to gas
Freezing
Gas to liquid
Condensation
Matter continues to gain or lose heat
Without changes in temperature
Ice melting
Temperature remain
Expansion and contraction of matter
Expansion
Matter gain heat,expand become bigger
Example
Metal ball can't pass through the hole
After heating,the metal can pass through
Metal ring expanding,so there is space for the metal ball to pass through
Contraction
The example is same as expansion but the opposite
Uses of expansion and contraction in our daily
Example
Opening the lid of a tightly-closed bottle
Warm up the lid of a bottle with hot water,lid gain heat and expand
Allows us to twist open the lid of the tightly-closed bottle
Measuring temperature using a laboratory thermometer
Liquid used in laboratory thermometer is mercury or alcohol
When placed in hot objects,liquid gain heat and expand
When placed in cold objects,liquid lose heat and contract
Problem and solutions caused by expansion and contraction
Problem
When hot water is poured into a glass container,the glass container cracks
Expansion and solution
Glass container cracks caused by uneven expanison in different parts of the glass container
Inner wall gains heat and expands first before the outer wall,glass is a PCH,
Solution
Pour hot water into plastic container or other container that do no crack easily
The difference between heat and temperature
Heat
A form of energy
Can cause a thing to become hot or cold
Temperature
A measurement of the degree of hotness
Of a body
Place
Greater amount of heat
Higher temperature
Lesser amount of heat
Lower temeprature
Temperature
Thermometer
Measure accurately
How cold
How hot
Laboratory thermometer
Measure temperature of things during experiments
Containes a liquid in the glass tube
Alcohol
Mercury
Measure a longer range of temperatures
Clinical thermometer
Measure the temperature of human body
Using
Digitally
Liquid
Measures a shorter range
Measuring the temperature of the liquid
The bulb must be placed vertically in the liquid
Common units for measuring temperatures
degree Celsius
degree Fahrenheit
Read the temperature correctly
Eyes must be at the same level as the liquid in the thermometer