2. Complete Activity 3.2 (Page 25). Let us learn how to read a thermometer. First, note the temperature difference indicated between the two bigger marks. Also note down the number of divisions (shown by smaller marks) between these marks. Suppose the bigger marks read one degree and there are five divisions between them. Then, one small division can read 1/5 = 0.2 °C. Wash the thermometer, preferably with an antiseptic solution. Hold it firmly and give it a few jerks. The jerks will bring the level of mercury down. Ensure that it falls below 35°C. Now place the bulb of the thermometer under your tongue. After one minute, take the thermometer out and note the reading. This is your body temperature. The temperature should always be stated with its unit, °C. What did you record as your body temperature?
Answer:
The above activity can be carried out as follows:
Aim: To read a clinical thermometer correctly.
Materials Required: Mercury thermometer.
Procedure:
(i) Note the temperature difference between the two bigger marks and note the number of divisions between these marks. If the bigger marks read one degree and there are five divisions between them, one small division = = 0.20 C.
(ii) Wash the thermometer with antiseptic solution before using it.
(iii) Before using it hold it firmly and give it a few jerks. The jerks will bring the level of mercury down. Ensure that the mercury level is below 35°C.
(iv) Now place the bulb of the thermometer under your tongue.
(v) After one minute, take the thermometer out and note the reading to obtain your body temperature. The temperature should always be stated with its unit, °C.
(vi) Make sure you read the thermometer keeping the level of mercury along the line of sight as shown below:
(vii) Handle the thermometer with care to prevent it from breaking. (viii) Do not hold the thermometer by its bulb while reading it.
Observations: You will observe that your normal body temperature is 370 C.
Conclusions: We conclude that by following the correct procedure your body temperature can be obtained using a mercury thermometer.
“Complete Activity 3.2 (Page 25). Let us learn how to read a thermometer. First, note the temperature difference indicated between the two bigger marks. Also note down the number of divisions (shown by smaller marks) between these marks. Suppose the bigger marks read one degree and there are five divisions between them. Then, one small division can read 1/5 = 0.2 °C. Wash the thermometer, preferably with an antiseptic solution. Hold it firmly and give it a few jerks. The jerks will bring the level of mercury down. Ensure that it falls below 35°C. Now place the bulb of the thermometer under your tongue. After one minute, take the thermometer out and note the reading. This is your body temperature. The temperature should always be stated with its unit, °C. What did you record as your body temperature?” – Solved.
Related Links:
Solution to Extended Learning Problem 1
Solution to Extended Learning Problem 2
Solution to Extended Learning Problem 3
Solution to Extended Learning Problem 4
Solution to Extended Learning Problem 5
Solution to Activity 3.1
Solution to Activity 3.3
Solution to Activity 3.4
Solution to Activity 3.5
Solution to Activity 3.6
Solution to Activity 3.7
Solution to Activity 3.8
Solution to Activity 3.9
Solution to Activity 3.10
Solution to Activity 3.11
Solutions to Chapter 3 Heat
