now we have learned various types of measurement such length, weight, capacity
and time. But none of these measurements can be used to find how hot or cold
any object is.
we touch any hot or cold object, we can make out which is hot and which is
the question here is how much cold or how much hot. At the same time, it is
difficult to know the exact level of hotness or coldness by touch because the
sense of touch varies from one person to another. To find exact answer, we need
some measure of hotness or coldness.
is the measure of the hotness or coldness of an object with reference to some
standard value. The instrument which measures the temperature of body is known
thermometer has a scale. Two different temperature scales that are commonly
1. The Fahrenheit
Fahrenheit scale is marked from 32° F to 212° F. 32° F indicates the freezing
point of water and 212° F indicates the boiling point of water.
2. The Celsius Scale
scale is also called centigrade scale and is marked from 0° C to 100° C. 0° C indicates
the freezing point of water and 100° C indicates the boiling point of water.
Comparison of two scales
the temperature is given in degree Celsius:
Step 1: Multiply the given temperature in degree by 9
Step 2: Divide the product obtained by 5.
Step 3: Add 32 to the quotient obtained in step 2 to get the
temperature in degree Fahrenheit.
Example: 55° C
Here given temperature is 55° C.
To convert into degree Fahrenheit first multiply 55 by 9 and we
get product as 495.
Then, divide 495 by 5 and answer we get is 99.
Now, add 32 to 99 and final answer we get is 131.
Therefore, 55° C = 131° F
When the temperature is given in degree Fahrenheit:
Step 1: Subtract 32 from the given temperature in degree
Step 2: Multiply the difference obtained from step 1 by 5.
Step 3: Divide the product obtained from step 2 by 9 to get the
temperature in degree Celsius.
Example: 90° F
Here given temperature is 90° F.
To convert into degree Celsius first we need to subtract 32 from
90 and we get 58.
Then, multiply 58 by 5 we get answer as 290.
Now divide 290 by 9 and we get answer as 32.2.
Therefore, 90° F = 32.2° C
C = (F – 32) X 5/9
F = 9/5 X C + 32
medical thermometer, also known as a clinical thermometer is a thermometer used
to measure body temperature. Most of these thermometers have both the two scales,
Celsius scale and Fahrenheit scale. The scale runs from 35 degree Celsius to 42
temperature of a healthy human body is approximately 37 °C or 98.6 °F. The tip
of the thermometer is inserted into the mouth under the tongue or under the
armpit for a minute. Then, the number against the point at which
the mercury column stops rising further indicates the body temperature of the