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

### BASIC TECHNOLOGY

BASIC SCIENCE AND TECHNOLOGY

THIRD TERM

WEEK 8

PRIMARY 5

THEME – YOU AND ENERGY

PREVIOUS LESSON – Heat and Temperature I – Meaning and Different (Primary 5)

### LEARNING AREA

1. Introductory Activities

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, the pupils should have attained the following objectives (cognitive, affective and psychomotor) and should be able to –

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

5. Some ice water.

Heat and Temperature I – Meaning and Different (Primary 5)

Meaning of Heat and Temperature I – ASEI PDSI METHOD (Primary 5)

Heat and Temperature II – Units and Symbols of Temperature – ASEI PDSI METHOD (Primary 5)

Third Term Scheme of Work and Plan Lesson Note for Basic Science and Technology Primary 4, Primary 5 and Primary 6 Links

### 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

### WRITING INSTRUCTION

Copy as I write or draw as I write. This instruction should be given when you need the pupils to write or draw.

### LESSON 1 – INTRODUCTORY ACTIVITIES

Teacher’s Activities – Display sample of thermometer (of available) or a chart showing thermometer for the pupils to examine and guide them to state the features of a thermometer.

Pupil’s Activities – Active participation.

Teacher’s Remark – Thermometer is an device used for measuring temperature of a body. As mentioned by the pupils, write on the board. Discuss the unit and scale of a thermometer.

### 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

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 – INTRODUCTORY ACTIVITIES

Teacher’s Activities – Ask the pupils to exchange their home work for marking and correction.

Pupil’s Activities – Participate actively in the marking and correction.

Teacher’s Remark – Your is shown the relationship between Celsius and Fahrenheit. That’s, we have just changed Celsius to Fahrenheit. Now, we are going to changing Celsius to Fahrenheit properly.

### 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 1

Convert 25° Celsius to Fahrenheit.

First, 25°/5 = 5

Then, 5 × 9 = 45

Then, 45 + 32 = 77° F

Working Example 2

Convert 30º Celsius to Fahrenheit.

First, 30ª/5 = 6

Then, 6 x 9 = 54

Therefore,

54 + 32 = 86º F

QUICK EVALUATION

Convert

1. 20º Celsius to Fahrenheit.

2. 15º Celsius to Fahrenheit.

ASSIGNMENT

1. 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 – INTRODUCTORY ACTIVITIES

Teacher’s Activities – Ask the pupils to exchange their home work for marking and correction.

Pupil’s Activities – Participate actively in the marking and correction.

Teacher’s Remark – Your is shown the relationship between Fahrenheit and Celsius. That’s, we have just changed Fahrenheit to Celsius. Now, we are going to changing Fahrenheit to Celsius properly.

### CONVERSION OF CELSIUS TO FAHRENHEIT

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

Working Example 1

Convert 77º Fahrenheit to degree Celsius.

First, 77º — 32 = 45

Then, 45 x 5 = 225

Therefore,

225/9 = 25ºC

Working Example 2

Convert 86º Fahrenheit to degree Celsius.

First, 86º —32 = 54

Then, 54 x 5 = 270

Therefore,

270/9 = 30º Celsius

QUICK EVALUATION

Convert

1. 68º Fahrenheit

2. 59º Fahrenheit

to Celsius.

ASSIGNMENT

Find out 5 uses of thermometer.

### LESSON THREE – INTRODUCTORY ACTIVITIES

Teacher’s Activities – Based on the previous assignments, lead the pupils to discuss some of the uses of thermometer.

Pupil’s Activities – Participate actively in the class discussion.

Teacher’s Remark – Listen to the pupil’s discussion and get involved. Comment and not the uses of thermometer on the board.

### THE 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. Uses charts to guide the pupils to identify and name the units and symbols for temperature.

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

3. Guides pupils to state the relationship Celsius and Fahrenheit.

Pupil’s Activities – Concert one unit to another.

4. Discuss the uses of thermometer.

Pupil’s Activities – Participate in the class discussion.

5. Summarizes the lesson on the board.

Pupil’s Activities – Copy as the teacher writes.

### CONCLUSION

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

### LESSON EVALUATION

1. write the units and symbols of temperature

2. use thermometers to measure temperature accurately.

### 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. __________________________________________