# Heat and Temperature – Units and Symbols of Temperature Scale | Conversion bey Degree Celsius and Degree Fahrenheit Primary 5 (Basic 5) Term 2 Week 7 Basic Technology

**BASIC TECHNOLOGY **

BASIC SCIENCE AND TECHNOLOGY

THIRD TERM

WEEK 7

PRIMARY 5

THEME – YOU AND ENERGY

**TOPIC – UNITS AND SYMBOLS OF TEMPERATURE **

**LEARNING AREA **

1. Introduction

2. Units and Symbols of Temperature Scale

3. Relationship between Degree Celsius and Degree Fahrenheit

4. Some uses of Thermometer

4. Lesson Evaluation and Weekly Assessment (Test)

**PERFORMANCE OBJECTIVES **

By the end of the lesson, most of the pupils should have attained the following objectives –

1. identify and write the units and symbol of temperature scale.

2. relationship between degree Celsius and Degree Fahrenheit.

3. use the thermometer to measure the temperature of objects accurately.

**RATIONALE**

Heat is the cause, a rise in temperature is the effect. When a substance is hot, the temperature is high and when the substance is less hot (cold), the temperature is lower.

Temperature can be measured with a thermometer in degree Celsius and degree Fahrenheit called unit. The relationship between the two (2) units can be expressed as unit of one another

**ENTRY BEHAVIOUR **

The pupils can add, subtract, divide and multiple.

**INSTRUCTIONAL MATERIALS**

The teacher will teach the lesson with the aid of:

1. A chart showing different thermometers

2. A chart showing the units and symbols of temperature correctly.

3. Different thermometers

4. Flask of hot water.

5. Some ice water.

**METHOD OF TEACHING **

Choose a suitable and appropriate methods for the lessons.

Note – Irrespective of choosing methods of teaching, always introduce an activities that will arouse pupil’s interest or lead them to the lessons.

**REFERENCE MATERIALS**

1. Scheme of Work

2. 9 – Years Basic Education Curriculum

3. Course Book

4. All Relevant Material

5. Online Information

**CONTENT OF THE LESSON **** **

**LESSON 1 – INTRODUCTION **

Heat is the cause, a rise in temperature is the effect.

When a substance is hot, the temperature is high and when the substance is less hot (cold), the temperature is lower.

Temperature can be measured with a thermometer in degree Celsius and degree Fahrenheit called unit.

The relationship between the two (2) units can be expressed as unit of one another

### MEANING OF THERMOMETER

Thermometer is an device used to measure temperature of a body or an object.

For example, how hot or cold is water, food, iron, human body, etc.

**FEATURES OF A THERMOMETER **

The features of thermometer are

1. Scale – degree Celsius (ºC) and Fahrenheit (ºF)

2. Work liquid

3. Reference point

4. Bulb

**UNITS AND SYMBOLS OF TEMPERATURE SCALE **

There are two (2) units of measurement for temperature,namely –

1. Degree Celsius (ºC)

2. Degree Fahrenheit (ºF)

**QUICK EVALUATION**

Ask the pupils,

1. Define thermometer.

2. State the features of thermometer.

3. State the 2 units of measurement for temperature. With appropriate scales.

**ASSIGNMENT **

Solve the following –

1. Divide 20 by 5, then multiply by 9, then add 32.

2. Divide 50 by 5, then multiply by 9, then add 32.

3. Divide 75 by 5, then multiply by 9, then add 32.

**LESSON 2 – **CONVERSION OF CELSIUS TO FAHRENHEIT

Remember the Hint— Celsius (°C) to Fahrenheit (°F), Divide by 5, then multiply by 9, then add 32

Working Example 1Convert 25° Celsius to Fahrenheit.

First, 25°/5 = 5

Then, 5 × 9 = 45

Then, 45 + 32 = 77° F

Working Example 2Convert 30º Celsius to Fahrenheit.

First, 30ª/5 = 6

Then, 6 x 9 = 54

Therefore,

54 + 32 = 86º F

QUICK EVALUATIONConvert

1. 20º Celsius to Fahrenheit.

2. 15º Celsius to Fahrenheit.

ASSIGNMENT1. Subtract 32 from 77, then multiply by 5, then divide by 9.

2. Subtract 32 from 86, then multiply by 5, then divide by 9.

**LESSON 3 – **CONVERSION OF CELSIUS TO FAHRENHEIT

Remember the Hint —°F to °C: Subtract 32, then multiply by 5, then divide by 9.

Working Example 1Convert 77º Fahrenheit to degree Celsius.

First, 77º — 32 = 45

Then, 45 x 5 = 225

Therefore,

225/9 = 25ºC

Working Example 2Convert 86º Fahrenheit to degree Celsius.

First, 86º —32 = 54

Then, 54 x 5 = 270

Therefore,

270/9 = 30º Celsius

QUICK EVALUATION

Convert the following to Celsius,

1. 68º

2. 59º

3. 36

4. 40

**ASSIGNMENT**

Find out 5 uses of thermometer.

**LESSON 3 – T****HE USES OF THERMOMETER **

Thermometers are used to measure temperature. Below is a list of some uses in which a thermometer might be used.

1. It is used to measure the outdoor temperature.

2. It is used to measure body temperature – the doctor.

3. It is used to measure body temperature when someone is ill to determine if the person has a fever.

4. It is used to measure the temperature of an experiment.

5. It is used to measure the temperature of a cold room.

**PRESENTATION**

To deliver the lesson, the teacher adopts the following steps:

1. To introduce the lesson, the teacher revises the previous lesson. Based on this, he/she asks the pupils some questions;

2. Displays a sample of thermometer, if available or chart showing digital and analogue thermometer.

3. Lets pupils identify and examine the contents of the chart.

4. Guides pupils to identify the features of the thermometer.

Pupil’s Activities – Identify and state the features of the thermometer.

5. Uses charts to guide the pupils to introduce the unit and symbols of thermometer.

Pupil’s Activities – Identify the units and symbols of temperature.

6. Displays a chart showing the relationship between the two units of thermometer.

7. Guides pupils to identify and state the relationship Celsius and Fahrenheit.

Pupil’s Activities – Identify the relationship Celsius and Fahrenheit.

8. Guides pupils to apply the step convert Celsius and Fahrenheit to one another.

Pupil’s Activities – Follow the steps to convert the two units to one another.

9. Uses the previous excursion to leads and guide pupils to state the uses of thermometer.

Pupil’s Activities – State the uses of clinical thermometer and other thermometers.

10. Summarizes the lesson on the board.

Pupil’s Activities – Participate actively in the lesson summary and write as instructed.

**CONCLUSION**

To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson.

### NEXT LESSON

**LESSON EVALUATION **

Ask pupils to:

1. write the units and symbols of temperature

2. use thermometers to measure temperature accurately.

3. convert Celsius and Fahrenheit to one another.

### WORKBOOK

### WEEKLY ASSESSMENT

1. _______ is an device used for measuring temperature of a body.

A. Computer

B. Thermometer

C. Calculator

Match the following with the correct term.2. Fahrenheit Subtract 32, then multiply by 5, then divide by 9.

3. Celsius Divide by 5, then multiply by 9, then add 32.

4. _______ is divide by 5, then multiply by 9, then add 32.

A. Fahrenheit

B. Celsius

C. ºC and ºF

5. _______ divide by 5, then multiply by 9, then add 32.

A. Fahrenheit

B. Celsius

C. ºC and ºF

6. Convert 77º Fahrenheit to degree Celsius.

7. Convert 86º Fahrenheit to degree Celsius.

8. Convert 20º Celsius to Fahrenheit.

9. Convert 15º Celsius to Fahrenheit.

10. State 2 uses of thermometer.

A. __________________________________________

B. __________________________________________