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Heat - Coggle Diagram
Heat
Thermometers
A thermometer is used to measure accurately how hot or cold a body or place is
Types of thermometer
Clinical thermometer
To measure
the temperature of the human body in hospitals or clinics
Using
Digitally
Liquid
Range
Short
35°C to 42°C
Kink
Laboratory thermometer
To measure
the temperature of things during experiments
Using
A liquid
Mercury
Alchohol
Range
Long range
-10°C to 110°C
Our sense if touch
Cannot tell us accurately
how much hotter one object is to the other
How to read from a thermometer correctly
Eyes must be at the same level as the liquid in the thermometer
which is positioned vertically
the common units for measuring temperatures
degree clesius
degree fahrenheit
when measuring the temperature of a liquid
the bulb of the thermometer must be places vertically in the liquid
Effects of heat gain and heat loss
Change in states or matter
When object gains heat
It change from solid
to liquid
to gas
Process of gases changing into liquids
Condensation
Process of liquids changing into solids
Freezing
expansion and contraction of matter
Heat flow can cause matter to expand / becomes bigger
Heating metal ring
before
metal ball cannot pass through the metal ring
after
metal ball can pass through
Change in temperature
Heat gain can cause a change in temperature
When an object loses heat
Temperature decreases
when an object gains heat
temperature increase
A graph can be used to show changes in temperature of an object caused by
Heat gain
Heat loss
good and poor conductors of heat
When two objects touch each other
Heat flow takes place when both objects
Have different temperatures
Poor conductors of heat
Eg
plastic
rubber
glass
air
fabric
wood
Good conductors of heat
Eg
Metal
The thickness of a material
can affect how fast heat flow takes place in the material
Both poor conductors of heat have useful applications in our daily lives
Good conductor
metal
used to make cooking utensils or heating elements
Poor conductor of heat
wool, fur, feathers
used to make winter clothing or shoes
Plastic
handle of a cooking pan
The conduction of heat by different materials can be used to explain some situations in our daily lives
when matter loses heat
it contracts and become smaller
before cooling the metal ball cannot pass through the ring
after the ball is cooled
the metal ball can pass though it
this is because the metal ball contract
and become smaller so there is space
for the metal ball to pass through the metal ring
expension video
https://www.youtubekids.com/watch?v=R9uvIhgVz04
difference between heat and temperature
the effects of the amounts of heat on its temperature
Object containing a greater amount of heat
It is hotter
Has a higher temperature
Object containing a smaller amount of heat
Colder
Lower in temperature
Objects made up of the same material
Same temperature
Different amount of matter / volume
Do not contain the same amount of heat in them
Less matter / volume
Less heat
More matter / volume
More heat
Temperature is a measurement of the degree of hotness of a body or place.
More heat is needed to
Warm up a greater amount of heat
of the same type of object to the same type of temperature
Heat is a form of energy
Become Hot
Become Cold
Heat flow
Heat always flows from
Hotter to colder object
Until all of them reach the same temperature
Through heat flow an object
becomes Hot
by gaining heat
become cold
by losing heat
an object can become hot or cold because of
heat flow
in our surroundings
Heat flow will continue to take place
between
Cold objects
Can of cola taken out from a refrigerator
can of cola will gain heat from
surrounding air
warmed o the temperature same as the surroundings
Hot objects
Hot coffee is placed on kitchen table
Hot coffee loses heat to
surrounding air
Will be cooled to room temperature
Same as the surroundings
Sources of heat
Fuels are things that produce heat when burn
Examples
Petroleum
Natural gas
Coal
Wood
Oil
They give off light and heat
Some electrical appliances can produce heat
Electrical appliances that can generate heat
Examples
oven
water heater
toaster
Sources of heat
Things that produce heat
The main source of heat on the earth
The sun
Heat from the sun helps keep the earth warm.
we feel warm caused by the heat of the sun
Light allows us to see
Some can also be sources of light
Introduction to heat
Heat is a form of energy. It can makes things hot
Heat is not matter
but we can feel its effects by our sense of touch