in an ungraduated thermometer,the length of the mercury thread is 25mm when the thermometer is immersed in ice at 0 degrees celsius and 250mm in steam at 100 degrees celsius.
(i)What temperature in degrees celsius corresponds to a thread length of 61mm?
(ii)What change in thread length is produced when the temperature is changed from35 degrees celsius to 75degrees celsius?
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Answer:
a mercury thermometer, the lower fixed point is 0
o
C and upper fixed point is 100
o
C. The mercury thread rises four fifth of the distance between 0
o
C and 100
o
C.
l) Four fifth of celsius scale
=
5
4
×100
o
C
=80
o
C
Temperature of water in celsius scale =80
o
C
ll) Temperature of water in fahrenheit scale
=
5
9×80
+32
=176℉
where the conversion formula
(f−32)/9=C/5 is used
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