Heat

What is heat?

• Heat is a form of energy.
• It gives  sensation feeling to us.

• Example: If we touch any object with too much heat it gives us an burning sensation.

• For example, in the cellphone that we use , heat is being released in form of radiation.

Temperature

• Temperature is the degree of heat
• Or we can say it is the degree of heat or coldness
• There are 3 basic units in the thermometer that we use to measure temperature

The 3 Units for measuring temperature

1.Celcius- It is the most commonly used unit 
2.Fahrenheit- This unit was used in the ancient times
3.Kelvin- This unit is rarely used

Thermometer

• Thermometer is used for measuring temperature
  There are 2 types of thermometer

1. Clinical Thermometer
2. Laboratory Thermometer

Clinical Thermometer

• Used by doctors to measure the temperature of their patients.

• Now we use the infrared thermometer but before they use the clinical thermometer.

• It can measure from 35℃ to 42 ℃

Clinical thermometer and

infrared thermometer

Clinical Themometer

• In the middle of the thermometer there is an tube.

• In that tube there is mercury.

• The mercury adjusts to temperature by moving up or down

• There is an metal cap in the right end part.  

• This thermometer has a kink.

• The kink stops the mercury from falling down if the thermometer is held vertically.

• Infrared thermometer measures temperature in seconds.

•  It Measures body temperature

Laboratory thermometer

• Laboratory thermometer is used by scientists.

• We have to hold the the thermometer upside down

• Because, the mercury will fall down.

• It is because kink is absent in laboratory thermometer.

• It doesn't have a kink.

• It is from -10 degree to -110 degree.