﻿ Temperature - Class 5 Maths Chapter 8 Question Answer

# Temperature

## Temperature - Sub Topics

In this chapter, we will deal with the concept of temperature and understand its impact on our daily lives. Temperature serves as a fundamental concept that enables us to determine the degree of warmth or coldness in our surroundings. We witness temperature variations throughout the changing seasons.

• What is Temperature?
• Temperature Measurement Units
• Conversion of Units of Temperature
• Solved Questions on Temperature
• ## What is Temperature?

Temperature is a measure of how warm or cool something is. We experience a large number of items that can be sorted as either hot or cold. It is represented by the letter 'T'.

Objects with a high temperature are hot objects like a bulb, a steaming cup of coffee, a thundering fire, the searing sun, etc.

On the other hand, objects with a low temperature are cold objects like ice cubes, chilled refreshments, snow, frozen yogurt, etc.

We feel warm in the summer season and cold in the winter season.

## Temperature Measuring Instrument:

A temperature measuring instrument is a thermometer that serves as a tool employed for temperature measurement which comprises a sealed glass tube with a narrow bore that contains a liquid as mercury.

Modern thermometers use digital technology for temperature measurement. Digital thermometers which don't contain mercury are mostly used in hospitals and clinics.

## Temperature Measurement Units

Temperature can be expressed using the following units:

→ Celsius (°C)
→ Fahrenheit (°F)
→ Kelvin (K)

The degree (°) is used in temperature measurement to represent degrees on various temperature scales in Celsius (°C) and Fahrenheit (°F).

### Conversion of Units of Temperature:

Formulae for converting temperature from one unit to another are as follows:

Celsius to Fahrenheit:

→ [°F] = [°C] × 9/5 + 32

OR

→ [°F] = [°C] × 1.8 + 32

Fahrenheit to Celsius:

[°C] = 5/9 × [(°F) − 32]

Celsius to Kelvin:

→ [K] = [°C] + 273.15

Kelvin to Celsius:

→ [°C] = [K] − 273.15

These conversions allow you to change temperature values between Celsius, Fahrenheit and Kelvin units.

Let us solve some examples to understand them better.

Example 1: What is the room temperature in Kelvin if the room temperature is 38.47°C less than the temperature shown on the thermometer?

a) 28 K
b) 304.48 K
c) 304.68 K
d) 304.88 K

Explanation: Temperature shown on the thermometer = 70°C

Room temperature if the room temperature is 38.47°C less than the temperature shown on the thermometer.

Room temperature = 70°C − 38.47°C
= 31.53°C

Using [K] = [°C] + 273.15

Room temperature in Kelvin = 31.53°C + 273.15
= 304.68 K

Example 2:  The temperature in the hall was 93.45°F this evening. After three hours, it had gone up by 28.2°F and then the temperature fell by 35.65°F after four hours. What was the temperature in °C after seven hours?

a) 27°C
b) 30°C
c) 54°C
d) 60°C

Explanation: Temperature after 7 hours = (93.45 + 28.2 – 35.65)°F
= 86°F

Using [°C] = 5/9 × [(°F) - 32)]

Temperature in °C after 7 hours = 5/9 × [(86°F) - 32]
= 5/9 × 54
= 30°C