Temperature and its Measurement Class 6 (Curiosity)

(Page 137) The normal temperature of a healthy human being is close to ……………… (i) 98.6 °C (ii) 37.0 °C (iii) 32.0 °C (iv) 27.0 °CNormal human body temperature = 37.0 °C or 98.6 °F

(Page 137) 37 °C is the same temperature as …………… (i) 97.4 °F (ii) 97.6 °F (iii) 98.4 °F (iv) 98.6 °FNormal human body temperature = 37.0 °C
If we convert it into Fahrenheit then 𝑭=𝟗/𝟓 𝑪+𝟑𝟐
So, 37.0 °C = 𝟗/𝟓 (𝟑𝟕)+𝟑𝟐 = 𝟑𝟑𝟑/𝟓 + 32
= 66.6 + 32 = 98.6 °F

(Page 137) Fill in the blanks: (i) The hotness or coldness of a system is determined by its ……………….....What is Temperature?What is Temperature?Example 1
Freshly Made Tea
Tea After Some Time
It is hot
(has higher Temperature)
It is Cold
(has lesser Temperature)

(Page 137) Fill in the blanks: (ii) The temperature of ice - cold water cannot be measured by a …………… thermometer. Explanation :-
A clinical thermometer can measure temperatures only from 35°C to 42°C, which is the range of human body temperature. Ice - cold water is usually around 0°C, which is below the lower limit of a clinical thermometer.
Therefore, we cannot use a clinical thermometer to measure the temperature of ice-cold water.

Normal human body temperature = 37.0 °C
If we convert it into Fahrenheit then 𝑭=𝟗/𝟓 𝑪+𝟑𝟐
So, 37.0 °C = 𝟗/𝟓 (𝟑𝟕)+𝟑𝟐 = 𝟑𝟑𝟑/𝟓 + 32
= 66.6 + 32 = 98.6 °F
There are three units of temperature :-
Degree Celsius
Degree Fahrenheit
Kelvin
The SI of Temperature is Kelvin
But with Kelvin we do not use Kelvin
So, the unit of temperature is either degree Celsius or degree Fahrenheit

(Page 137) The range of a laboratory thermometer is usually …………………………… (i) 10 °C to 100 °C (ii) –10 °C to 110 °C (iii) 32 °C to 45 °C (iv) 35 °C to 42 °CThe temperature of Ice - cold water is usually around 0°C which can be measured by a Laboratory Thermometer
So, the range of Laboratory Thermometer should cover 0°C
(– 10 °C to 110 °C )

(Page 137 and 138) Four students used a laboratory thermometer to measure the temperature of water as shown : Who do you think followed the correct way for measuring temperature? (i) Student 1 (ii) Student 2 (iii) Student 3 (iv) Student 4Student 1 The thermometer should be held vertically not be tilted.
So, Student 1 is not measuring the temperature correctly
Student 2 The thermometer is held vertically
The thermometer is not tilted.
So, Student 2 is measuring the temperature correctly
Student 3When the thermometer is immersed in water,
its bulb should not touch the bottom of the beaker
So, Student 3 is not measuring the temperature correctly
Student 4When the thermometer is immersed in water, its bulb should not touch the sides of the beaker
So, Student 4 is not measuring the temperature correctly
Final Answer Four students used a laboratory thermometer to measure the temperature of water as shown : Who do you think followed the correct way for measuring temperature? (i) Student 1 (ii) Student 2 (iii) Student 3 (iv) Student 4Student 2 is measuring the temperature correctly as the thermometer is held vertically and it is not tilted.

(Page 138) Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written below :Between 10°C and 20°C, there are 5 divisions.
So each division measures:
(20^∘ 𝐶−10^∘ 𝐶)/50=(10^∘ 𝐶)/5=2^∘ 𝐶
Each division measures 2°C.
Question 6 (Page 138) Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written below :Between 10°C and 20°C, there are 10 divisions.
So each division measures:
(20^∘ 𝐶−10^∘ 𝐶)/10=(10^∘ 𝐶)/10=1^∘ 𝐶
Each division measures 1°C.
Question 6 (Page 138) Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written below :Between 10°C and 20°C, there are 20 divisions.
So each division measures:
(20^∘ 𝐶−10^∘ 𝐶)/20=(10^∘ 𝐶)/20=〖0.5〗^∘ 𝐶
Each division measures 0.5°C.

(Page 138) Observe the part of thermometer shown in Fig. 7.8 and answer the following questions: (i) What type of thermometer is it?It is a Laboratory Thermometer.
Explanation :- There are two types of Thermometer normally used :- Clinical Thermometer and Laboratory Thermometer
In Clinical, the range is from 35°C to 42°C
In Laboratory, the range is from -10°C to 110°C
In the above figure, the range is starting from -10°C
So, It is a Laboratory Thermometer

(Page 138) Observe the part of thermometer shown in Fig. 7.8 and answer the following questions: (ii) What is the reading of the thermometer? Between 20°C and 30°C, there are 10 divisions.
So each division measures:
(30^∘ 𝐶−20^∘ 𝐶)/10=(10^∘ 𝐶)/10=1^∘ 𝐶
Each division measures 1°C.
So, The reading of the thermometer is 26°C

(Page 138) Observe the part of thermometer shown in Fig. 7.8 and answer the following questions: (iii) What is the smallest value that this thermometer can measure?Look at the markings:
The gap between two large numbered marks (e.g., 20 to 30) = 10°C
Inside this gap, there are 10 small divisions
So each small division =
(10^∘ 𝐶)/10=1^∘ 𝐶
The smallest value that this thermometer can measure = 1°C.

(Page 138) A laboratory thermometer is not used to measure our body temperature. Give a reason. kink
Clinical Thermometer
In this thermometer, there is a kink (constriction) which prevents the mercury from falling down after the thermometer is removed from the body . This helps in taking accurate reading .
Laboratory Thermometer
In this thermometer, there is no kink .
So, mercury falls back immediately as soon as thermometer removed from the mouth.

(Page 139) Vaishnavi has not gone to school as she is ill. Her mother has kept a record of her body temperature for three days as shown in Table 7.4. (i) What was Vaishnavi’s highest recorded temperature? Vaishnavi’s highest recorded temperature is 40.0°C .

(Page 139) Vaishnavi has not gone to school as she is ill. Her mother has kept a record of her body temperature for three days as shown in Table 7.4. (ii) On which day and at what time was Vaishnavi’s highest temperature recorded?On Day One at 7 pm was Vaishnavi’s highest temperature recorded .

(Page 139) Vaishnavi has not gone to school as she is ill. Her mother has kept a record of her body temperature for three days as shown in Table 7.4. (iii) On which day did Vaishnavi’s temperature return to normal?Normal Temperature is 37°C
On Day Three at 4 pm, Vaishnavi’s temperature returned to normal

(Page 139) If you have to measure the temperature 22.5 °C, which of the following three thermometers will you use (Fig. 7.9)? Explain.Let’s Understand the three thermometers
Thermometer (a)Between 0°C and 10°C, there are 10 divisions.
So each division measures:
(10^∘ 𝐶−0^∘ 𝐶)/10=(10^∘ 𝐶)/10=1^∘ 𝐶
Each division measures 1°C.
So, It cannot measure 22.5°C .
Thermometer (b)Between 0°C and 10°C, there are 20 divisions.
So each division measures:
(10^∘ 𝐶−0^∘ 𝐶)/20=(10^∘ 𝐶)/20=〖0.5〗^∘ 𝐶
Each division measures 0.5°C.
So, It can measure 22.5°C .
Thermometer (c)Between 0°C and 10°C, there are 5 divisions.
So each division measures:
(10^∘ 𝐶−0^∘ 𝐶)/5=(10^∘ 𝐶)/5=2^∘ 𝐶
Each division measures 2°C.
So, It cannot measure 22.5°C .
Final Answer If you have to measure the temperature 22.5 °C, which of the following three thermometers will you use (Fig. 7.9)? Explain.So, the answer is (b) because it has more divisions

(Page 140) The temperature shown by the thermometer in Fig. 7.10 is (i) 28.0 °C (ii) 27.5 °C (iii) 26.5 °C (iv) 25.3 °CThe reading of the thermometer is 27.5°C

(Page 140) A laboratory thermometer has 50 divisions between 0 °C and 100 °C. What does each division of this thermometer measure? Between 0°C and 100°C, there are 50 divisions.
So each division measures:
(100^∘ 𝐶−0^∘ 𝐶)/50=(100^∘ 𝐶)/50=2^∘ 𝐶
Each division measures 2°C.

(Page 140) Draw the scale of a thermometer in which the smallest division reads 0.5 °C. You may draw only the portion between 10 °C and 20 °C.Between 10°C and 20°C, each division should measure 〖0.5〗^∘ 𝐶 (20^∘ 𝐶−10^∘ 𝐶)/(N𝑜. 𝑜𝑓 𝐷𝑖𝑣𝑖𝑠𝑖𝑜𝑛𝑠 )=〖0.5〗^∘ 𝐶 (10^∘ 𝐶)/(N𝑜. 𝑜𝑓 𝐷𝑖𝑣𝑖𝑠𝑖𝑜𝑛𝑠 )=〖0.5〗^∘ 𝐶 10^∘ 𝐶=〖N𝑜. 𝑜𝑓 𝐷𝑖𝑣𝑖𝑠𝑖𝑜𝑛𝑠 × 0.5〗^∘ 𝐶 〖N𝑜. 𝑜𝑓 𝐷𝑖𝑣𝑖𝑠𝑖𝑜𝑛𝑠 × 0.5〗^∘ 𝐶=10^∘ 𝐶 N𝑜. 𝑜𝑓 𝐷𝑖𝑣𝑖𝑠𝑖𝑜𝑛𝑠=(10^∘ 𝐶)/(〖0.5〗^∘ 𝐶) N𝑜. 𝑜𝑓 𝐷𝑖𝑣𝑖𝑠𝑖𝑜𝑛𝑠=100/5=20 divisions

(Page 140) Komal tells you that she has a fever of 101 degrees. Does she mean it on the Celsius scale or Fahrenheit scale? She means it on the Fahrenheit (°F) scale.
Explanation :- She is using a Clinical Thermometer whose range is 35 °C – 42 °C or 95 °F – 108 °F
So, 101 °F lies in range of Fahrenheit and not Celsius.
If it was 101°C, that would be extremely high and impossible for a human body, as 101°C is above boiling point of water.