Students Learning Outcomes
- Draw and label the device for measuring temperature.
- Measure and record the body temperature using a laboratory thermometer and clinical thermometer.
- Suggest the safety measures required in using thermometers. Img
Information for Teachers
- Temperature of body is measured by a device called Thermometer.
- There are two types of thermometer;
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- A laboratory thermometer.
- A clinical thermometer.
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- There are two common scales on the thermometers;
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- Celsius or Centigrade scale, (C)
- Fahrenheit scale,(F)
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- A laboratory thermometer has Centigrade scale with two prominent 0C and 100C.
- Clinical thermometer is designed to give reading only from 35C to 42C or 95F to 108F.
- Temperature beyond above ranges is not possible.
- There is constriction inside the clinical thermometer.
- Water freezes at 0C and boils at 100C.
- A healthy human body has temperature 37C or 98F.
- Thermometers are used carefully to avoid breakage.
Material / Resources
Writing board, chalk/marker, duster, candle, match box, tape water, two beakers of different sizes, an iron rod, two laboratories and two clinical thermometers preferably filed with some colored liquid, some ice cubes, a wooden blocl, textbook
Worm up Activity
- Do the following worm up activities to involve the students;
- Divide whole class in two groups.
- Provide a laboratory thermometer and a clinical thermometer to each group.
- Explain the division made on thermometers.
- Ask them in which of given thermometers, there is a constriction.
- If their answer is the clinical thermometer, then ask them;
- “What is the use of this construction?”
- Instruct a student from each group to grasp the bulbs of thermometer in both hands for 1 minute.
- Ask the other student to observe the rising liquid level in both the thermometers.
- Now direct the students to hold the thermometer from top.
- Ask the students to observe the descending liquid level in both the thermometers.
- Ask them “What did they observe?” (Expected Students` response: The liquid level falls promptly in that thermometer which is without constriction. It is the laboratory thermometer) )
- Inform the students that a constriction doesn`t allow the liquid level to fall down. Due to this reason, the reading remains the same in a clinical thermometer for reasonable time.
- Ask how we can bring the level of liquid down in this thermometer. (A jerk is applied to the clinical thermometer to bring the liquid down into the bulb.
Development
Activity 1
- Divide the class into groups.
- Give each group a laboratory thermometer and a clinical thermometer.
- Ask two selected students from each group to place the given laboratory thermometer and a clinical thermometer under their arms pits, carefully.
- After two minutes, ask them to show their thermometers to their group fellows to note their body temperatures.
- Draw the table on the board and make a list of reading found by groups.
| Groups | Temperature on 0C- scale | Temperature on 0F- scale |
| Group 1 | 37 C | 99 F |
| Group 2 | 36 C | 98 F |
- Inform the students that the temperature of healthy person is ranges from 36 C to 37 C or 98 F to 99 F.
Activity 2
- Ask the students “What cares are required in using thermometers?”
- Make a list of their proper answers on the board.
- Students` responses;
- Don`t insert the thermometer directly into the mouth.
- Avoid striking the thermometer to a hard thing.
- Don`t put the bulb of thermometer directly into the flame.
Activity 3
- Put some ice cubes in the fresh water in a small beaker and shake it well.
- Ask the students to note the thermometer of mixture by using a thermometer.
- Instruct them to take two reading each after ever 2 minute interval.
- Prepare a table of observances;
| Time taken | Temperature |
| 2 minutes | 6 C |
| 4 minutes | 3 C |
- Ask the students that what will happen to temperature if more ice is added into the beaker?
Sum up / Conclusion
- Temperature of body is measured by a device called Thermometer.
- There are two types of thermometer;
- A laboratory thermometer.
- A clinical thermometer.
- There are two common scales on the thermometers;
- Celsius or Centigrade scale, (C)
- Fahrenheit scale,(F)
Assessment
- Ask some purpose –fit questions like:
- A person is suffering from fever; now guess his/her body temperature on both the scales.
- Name the cities of Pakistan which are at very low and very high temperature.
- Will the temperature of your healthy father and younger brother be the same?
- Teacher is also required to involve the students in solving the problems given in the exercise end of unit/chapter.
Follow up
- Ask the students to observe the temperature of their father, mother and other family by using thermometer under their arm pit.
- Record all readings in their notebooks.
