Lesson Notes By Weeks and Term v3 - Primary 5
Temperature
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Temperature
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
Subject: General Mathematics
Class: Primary 5
Term: 3rd Term
Week: 8
Theme: Mensuration And Geometry
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Pupils should be able to: compare degrees of hotness of various objects and are as (locations) in degree Celsius. identify the usefulness of temperature to our daily life.
This section provides the core content necessary for the teacher to deliver the lesson effectively.
Definition of Temperature: Temperature is a measure of the degree of hotness or coldness of a body or an environment. It tells us how much thermal energy is present in a substance. When an object feels hot, it has a high temperature; when it feels cold, it has a low temperature.
Unit of Measurement: The standard unit for measuring temperature in Nigeria and most parts of the world is degrees Celsius (°C). Another common unit is degrees Fahrenheit (°F), but the focus for this lesson is on Celsius.
Instrument for Measurement: The Thermometer A thermometer is the instrument used to measure temperature.
Types of Thermometers: Clinical Thermometer: Used to measure body temperature, typically ranging from 35°C to 42°
C. Laboratory Thermometer: Used in scientific experiments, with a wider range, often from -10°C to 110°
C. Room/Wall Thermometer: Used to measure the temperature of a room or the environment.
How a Thermometer Works: Most thermometers contain a liquid (like mercury or coloured alcohol) in a glass tube. When the liquid gets hotter, it expands and rises up the tube. When it gets colder, it contracts and falls down the tube. The scale marked on the glass tube shows the temperature in degrees Celsius.
Reading a Thermometer Scale: To read a thermometer:
1. Hold it at eye level to avoid parallax error.
2. Observe the level where the liquid column stops.
3. Read the corresponding number on the Celsius scale.
Example 1: If the liquid in a thermometer stops at the mark indicating 25, the temperature is 25°
C. Example 2: If the liquid is halfway between 30 and 32, the temperature is 31°
C. Comparing Temperatures: Comparing temperatures involves determining which object or location is hotter or colder. Higher Temperature = Hotter: A higher numerical value in degrees Celsius indicates a hotter object or environment. Lower Temperature = Colder: A lower numerical value in degrees Celsius indicates a colder object or environment.
Reference Points (Water): Freezing point of water: 0°C (very cold)
Boiling point of water: 100°C (very hot)
Normal human body temperature: Approximately 37°C Worked Examples for Comparison:
1. Scenario: The temperature in Lagos is 32°C, and the temperature in Jos is 25°
C. Question: Which city is hotter?
Explanation: Compare the values: 32°C is greater than 25°
C. Answer: Lagos is hotter than Jos.
2. Scenario: A cup of tea has a temperature of 60°C, and a glass of juice has a temperature of 10°
C. Question: Which drink is colder?
Explanation: Compare the values: 10°C is less than 60°
C. Answer: The glass of juice is colder than the cup of tea.
3. Scenario: Four objects have the following temperatures: Object A: 45°C, Object B: 15°C, Object C: 70°C, Object D: 28°
C. Question: Arrange these objects from the coldest to the hottest.
Explanation: Identify the lowest temperature first, then the next, and so on, until the highest temperature.
Solution: 15°C (Object B), 28°C (Object D), 45°C (Object A), 70°C (Object C).
Arrangement: Object B, Object D, Object A, Object
C. Usefulness of Temperature in Daily Life (Nigerian Context):
1. Weather and Climate: Clothing Choices: Knowing the daily temperature helps decide what to wear (e.g., heavy clothes during Harmattan in Northern Nigeria where temperatures can drop significantly, or light clothes during the hot dry season across much of the country).
Agricultural Planning: Farmers use temperature knowledge to determine optimal planting and harvesting times for crops like maize, yam, or rice, which thrive at specific temperatures.
Disaster Preparedness: High temperatures can indicate potential heatwaves, while sudden drops might signal changes in weather patterns.
2. Health and Wellness: Detecting Fever: A clinical thermometer is used to measure body temperature. A reading above 37.5°C usually indicates a fever, prompting a visit to the clinic or hospital.
Medication Storage: Some medicines require storage at specific temperatures (e.g., "keep in a cool, dry place" or refrigeration) to maintain their effectiveness.
3. Food and Drink: * Cooking: Recipes often specify cooking temperatures yam, or rice, which thrive at specific temperatures.
Disaster Preparedness: High temperatures can indicate potential heatwaves, while sudden drops might signal changes in weather patterns.
2. Health and Wellness: Detecting Fever: A clinical thermometer is used to measure body temperature. A reading above 37.5°C usually indicates a fever, prompting a visit to the clinic or hospital.
Medication Storage: Some medicines require storage at specific temperatures (e.g., "keep in a cool, dry place" or refrigeration) to maintain their effectiveness.
3. Food and Drink: Cooking: Recipes often specify cooking temperatures (e.g., oven temperatures for baking bread or cakes).
Food Preservation: Refrigerators and freezers use low temperatures to slow down spoilage of perishable foods like meat, fish, and vegetables, common in Nigerian households and markets.
Serving Drinks: Drinks are often served chilled (low temperature) in Nigeria due to the generally warm climate.
4. Industry and Technology: Manufacturing: Many industrial processes, such as food processing (e.g., making beverages, dairy products), oil refining, or cement production, require precise temperature control.
Automobiles: Car engines have cooling systems to prevent overheating, indicated by a temperature gauge on the dashboard.
Teacher Activities: Introduction (5 minutes): Initiate a discussion by asking pupils about their experiences with hot and cold things (e.g., "What makes tea hot?" "What makes ice cream cold?" "How do you know when it's hot enough to sweat or cold enough to shiver?"). Introduce the term "temperature" as the measure of hotness or coldness.
Introducing the Thermometer (10 minutes): Present a real thermometer (clinical, laboratory, or wall thermometer if available) or a large diagram of one.
Explain its parts: the bulb, the stem, the liquid (mercury/alcohol), and the scale (Celsius). Demonstrate how to read the temperature from the scale, emphasizing reading at eye level. Demonstrating Temperature Comparison (15 minutes): Prepare three beakers or transparent containers: one with warm water, one with room temperature water, and one with cold water (or ice water). If thermometers are available, demonstrate measuring the temperature of each. If not, simulate the readings on a diagram. Record the temperatures on the board (e.g., Warm Water: 40°C, Room Water: 28°C, Cold Water: 5°C). Guide pupils to compare these temperatures, identifying the hottest and coldest. Introduce more comparative examples using Nigerian cities/locations (e.g., Maiduguri vs. Calabar, or a sunny spot vs. a shaded spot in the classroom).
Discussing Usefulness (10 minutes): Lead a discussion on why knowing temperature is important in daily life, prompting pupils to share ideas. Relate examples directly to the Nigerian context: "Why do we check the temperature of a sick child?" (Health) "Why do parents refrigerate leftover soup or jollof rice?" (Food preservation) "How does knowing the temperature help us choose clothes for school?" (Weather) "Why is it important to know the oven temperature when baking chin-chin?" (Cooking) Summarize the key uses of temperature.
Student Activities: Observation and Discussion (Introduction): Actively participate in the initial discussion about hot and cold experiences.
Thermometer Familiarization: Observe the teacher's demonstration of the thermometer, identify its parts, and practice reading temperatures from diagrams or real instruments (if available in groups). Temperature Comparison (Hands-on/Simulation): If materials are available, groups can use thermometers to measure and record temperatures of different water samples or objects. If not, pupils will study provided temperature values and compare them, identifying hotter/colder scenarios. Work in pairs or small groups to arrange given temperatures from coldest to hottest and vice-versa.
Brainstorming and Sharing (Usefulness): In groups, brainstorm and list different ways temperature is useful in their daily lives, focusing on local examples. Share their findings with the class. Answer teacher's questions about the importance of temperature. The teacher should guide pupils through these questions, explaining each step.
Question: Three cities in Nigeria recorded their temperatures at noon: Kano: 35°C, Port Harcourt: 29°C, and Enugu: 31°C. (a) Which city was the hottest? (b) Which city was the coldest? (c) Order the cities from coldest to hottest.
Solution: (a) Comparing 35°C, 29°C, and 31°C, the highest temperature is 35°
C. Answer: Kano was the hottest. (b) Comparing 35°C, 29°C, and 31°C, the lowest temperature is 29°
C. Answer: Port Harcourt was the coldest. (c)
Ordering from lowest to highest: 29°C (Port Harcourt), 31°C (Enugu), 35°C (Kano).
Answer: Port Harcourt, Enugu, Kano.
Commentary: This question directly assesses the ability to compare multiple temperatures and order them.
Question: A pupil's body temperature was measured as 39°C. The normal body temperature is around 37°C. (a) Is the pupil's body temperature higher or lower than normal? (b) What might this indicate?
Solution: (a) Comparing 39°C and 37°C, 39°C is higher than 37°
C. Answer: The pupil's body temperature is higher than normal. (b) A body temperature higher than normal (above 37.5°C) typically indicates a fever, which is a sign of illness.
Answer: This might indicate that the pupil has a fever or is unwell.
Commentary: This connects temperature comparison to a vital real-life application: health monitoring.
Question: A thermometer shows the liquid level exactly halfway between 20°C and 30°
C. What is the temperature reading?
Solution: Halfway between 20 and 30 is calculated as (20 + 30) / 2 = 50 / 2 =
2
5. Answer: The temperature reading is 25°
C. Commentary: This tests the ability to interpret a thermometer scale, especially when the reading is between marked intervals.
Question: Give two reasons why a Nigerian mother might need to know the temperature of something in her kitchen.
Solution: Reason 1: To ensure food safety, for example, checking the temperature of her refrigerator to make sure it's cold enough to preserve perishable foods like meat, fish, or stew, or checking if food is thoroughly cooked.
Reason 2: For cooking purposes, such as knowing the correct oven temperature for baking cakes or bread, or ensuring water is hot enough for making tea or for parboiling rice.
Commentary: This prompts learners to think about the practical applications of temperature in a familiar Nigerian household setting.
Weather and Agricultural Decisions: Application: In Nigeria, understanding daily and seasonal temperature variations is crucial. During the Harmattan season (cold and dusty, especially in Northern Nigeria), lower temperatures help people prepare by wearing warmer clothes. Conversely, during the dry season, high temperatures mean lighter clothing and increased hydration. Farmers in states like Benue (known for yam production) or Borno (for millet) use temperature knowledge to decide planting times, as different crops have optimal temperature ranges for growth.
Integration: Learners can be encouraged to check daily weather forecasts (often reported on radio/TV in Celsius) and discuss how it influences their day (e.g., "Today is 35°C, so I should wear light clothes and drink water.").
Health and Family Care: Application: Monitoring body temperature is a common practice in every Nigerian home, especially for children. A high temperature (fever) is a clear sign of illness, prompting parents to seek medical attention or administer first aid. Many local remedies for fever also acknowledge the body's temperature state.
Integration: Discuss scenarios where knowing a child's temperature is critical. "If a sibling is feeling hot, how do you confirm they have a fever, and what's the next step?" Food Safety and Preservation: Application: In a climate like Nigeria's, perishable foods spoil quickly without proper temperature control. Refrigeration (low temperatures) is essential for preserving items like fresh meat, vegetables, and cooked meals (e.g., 'Efo Riro', 'Egusi' soup). This knowledge prevents food waste and reduces the risk of foodborne illnesses.
Integration: Ask pupils about how their families store different foods (e.g., "Why does your mother put leftover stew in the fridge and not leave it on the table?"). Connect this to the concept of temperature slowing down spoilage.