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Temperature

Temperature
science Square
Science Square

What is Temperature? In our everyday life we all listen to a statement “Today the temperature is 23 degree Celsius or 23°C or some other value". Now have you ever asked yourself a question what exactly does temperature means? Let us understand it.

 

Maths class 3 Temperature

 

  • The intensity of the heat present in any body is known as temperature.

 

  • It is measured using an instrument called Thermometer.
  • The unit in which it is measured is Degree Celsius(°C) and the standard unit is Kelvin.(K)

 

Units and Conversions

 

There different units to measure the temperature and are listed below:

  1. Degree Centigrade or Degree Celsius – written as °C.
  2. Degree Fahrenheit - written as °F.
  3. Kelvin- written as K.

Kelvin is considered as the SI unit of temperature.

Formula:

Temperature in degree Celsius = 273 - Temperature in Kelvin

 

Example 1: Convert 23°C into Kelvin.

Solution: 1°C = 273- Temperature in K

Therefore 1 Kelvin = 273 – 1°C = 272 K.

 

Conversion from Degree Celsius to Fahrenheit:

The conversion can be done in following 3 steps:

  • Multiply the temperature in degree with 9.
  • Divide the answer by 5.
  • Add 32 to the answer obtained in step 2.

 

Example 2: Convert 23°C to °F.

Solution: Following the above 3 steps one by one we get,

(23 x 9) = 207 and then

(207 ÷ 5) = 41.4 and then

41.4 + 32 = 71.4°F.

 

Maths class 3 Temperature

 

From this figure we can learn two things:

  • As the reading of thermometer increases the value of heat increases and hence the body becomes more hot.
  • As the reading of thermometer decreases the value of heat decreases and hence the body becomes more cold.

Maths class 3 Temperature

 

Points to Remember

 

  • The normal temperature of a human body is 37 degree Celsius.

 

Maths class 3 Temperature

 

  • The Celsius is marked from 0°C to 100°C.
  • The Fahrenheit scale is marked from 32°F to 212°F.
  • The thermometer used for the medical purpose has a special name Clinical Thermometer.

Practice Question

Q1) What is the normal temperature of a human body?

Q2) At which temperature water starts to boil?

Q3) Convert the following to Degree Fahrenheit.

  1. 0°C
  2. 100°C
  3. 37°C

Q4) State True or False:

  1. 1°C = 273 K
  2. Water freezes at 100°C.
  3. Temperature of ice is 0°C.

 

Recap

  • Thermometer is used to measure temperature of any body.
  • Unit of temperature can be K or °C or °F.
  • Temperature in °C = 273 – Temperature in K.
  • 0°C = 32°F.
  • Temperature of ice is 0°C or 32°F.
  • Doctors use Clinical Thermometer to measure temperature of patients.

Quiz for Temperature

Q.1

Convert 41 °F into °C.

a) 5 °C
b) 10 °C
c) 15 °C
d) -5 °C

Q.2

Convert 68 °F into °C.

a) 5 °C
b) 10 °C
c) -20 °C
d) 20 °C

Q.3

Water freezes at ________.

a) 100 °C
b) - 1 °C
c) 0 °C
d) -10 °C

Q.4

What is the addition of temperature 4 °C and 73 °C?

a) 77 °C
b) 69 °C
c) 75 °C
d) none of the above

Q.5

Convert temperature from Celsius to Fahrenheit:

32 °C

a) 80 °F
b) 90 °F
c) 90.6 °F
d) 89.6 °F

Q.6

Convert temperature from Celsius to Fahrenheit:

6 °C

a) 6 °F
b) 32 °F
c) 44 °F
d) 42.8 °F

Q.7

What is the addition of temperature 8 °C and -3 °C?

a)

11 °C

b)

4 °C

c)

5 °C

d)

6 °C

Q.8

The daytime temperature is 12 °C, but by evening it has fallen by 4 degrees. What is the temperature in the evening?

a) 9 °C
b) 8 °C
c) 7 °C
d) 16 °C

Q.9

Convert 36 °C into K.

a) 309.15 K
b) 360 K
c) 237.15 K
d) none of the above

Q.10

You decide to wear a jacket to go outside your house. What is the temperature most likely to be?

a) 68 °C
b) 20 °C
c) 40 °C
d) 45 °C

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