Temperature Grade 2 Maths | Learning Concepts Orchids International
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Measurements

Temperature

Temperature tells us how hot or cold something is.

Examples:

G2_1a_Measuring temerature_Hot & Cold
  • Tea is hot, it has a higher temperature.
  • Ice cream is cold; it has a lower temperature.
G2_1b_Measuring temerature_Hot & Cold
  • Soup is hot, it has a higher temperature.
  • Juice is cold, it has a lower temperature.
  • By slightly touching the above objects, we can easily say whether it is hot or cold.
  • Hot objects have higher temperatures.
  • Cold objects have lower temperatures.

Hot and Cold whether

G2_2_Measuring temerature_Sunny day
  • When we go out on a summer afternoon, we feel very hot.
  • It means the temperature is high on a summer day.
G2_3_Measuring temerature_Snowy day
  • When we go out on a snowy evening, we feel very cold.
  • It means the temperature is low on a snowy day.

Measuring temperature:

  • By touching an object, we can identify whether it is hot or cold, but we can’t measure the temperature of the object. Because temperature is the degree of hotness or coldness.
  • We can measure the temperature by using an instrument called thermometer.

Thermometer:

  • Thermometer is a device used to measure Temperature.
    G2_4_Measuring temerature_Thermometer

Parts of the Thermometer:

  • Glass tube: Glass tube is a long cylindrical tube that is connected to the bulb.
  • Bulb with a liquid: The bulb is the lowest part of the thermometer, and has a spherical shape. Here, Mercury stays in liquid form. When the temperature is getting high, mercury in the bulb moves up in the glass tube.
  • Temperature scales: There are marked scales with numbers on both sides with respect to units of the temperature.
  • There are mainly two types of units of Temperature on a thermometer–
    1. ℃ – C stands for Celsius
    2. ℉ – F stands for Fahrenheit

Did you know?

Celsius and Fahrenheit are the names of the people who invented each of these units.

G2_5_Measuring temerature_Did you know
  • United States and some other countries use the Fahrenheit unit.
  • Rest of the countries in the world use Celsius unit.
G2_6_Measuring temerature_Used of C and F

Relation between Fahrenheit and Celsius:

G2_7_Measuring temerature_Relation of C and F

32 ℉ = 0 ℃

  • 32 ℉ is equal to 0 ℃.
  • In India we use a Celsius unit to measure temperature.

How to read Thermometer:

Example 1:

  • We will measure the temperature of the boiling water.

    G2_8_Measuring temerature_100 Degree celsius

  • After putting the thermometer in the hot water, the thermometer’s mercury level reached at the number 100.
  • Water boils at 100℃ temperature. It’s too hot.

Example 2:

  • We will measure the temperature of the ice.
    G2_9_Measuring temerature_0 Degree celsius
  • After putting the thermometer on the cold ice, the thermometer’s mercury level reached at the number 0.
  • Water freezes into ice at 0℃ temperature. It’s too cold.

Example 3:

  • We will measure the temperature of the normal glass of water.
    G2_10_Measuring temerature_Normal Temperature
  • After putting the thermometer in the normal glass of water, the thermometer’s mercury level reached at the number 20.
  • Temperature of the glass of water is 20℃. It’s a normal temperature.
  • When temperature is increasing, mercury level goes up.
  • When temperature is decreasing, mercury level goes down.
  • By observing the mark of the mercury level, we can measure
    the temperature of the object.

Different types of Thermometers:

G2_11a_Measuring temerature_Types of Thermometer
G2_11a_Measuring temerature_Types of Thermometer
G2_11a_Measuring temerature_Types of Thermometer
G2_11a_Measuring temerature_Types of Thermometer
G2_11a_Measuring temerature_Types of Thermometer

New words:

Freeze: To become hard (and often change into ice) because of extreme
cold.

Example:

G2_12_Measuring temerature_Freeze

We made a snowman in our balcony. It is frozen and stands like statue.

Did you know?

G2_13_Measuring temerature_Coldest river in the world
G2_14_Measuring temerature_Boiling river in the world
G2_15_Measuring temerature_Mind map
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