Question

How many scales of temperature are there? which scale's lower fixed point is 0℃ and what is difference between UFP AND LFP of this scale?​

Answer 1

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JEE-MAIN

Physics

Grade 11

Temperature Scale

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On a new scale of temperature ( which is linear ) and called the W scale, the freezing and boiling points of water are 39W

and 239W

respectively. What will be the temperature on the new scale, corresponding to a temperature of 39∘C on the Celsius scale?

(A)200W

(B)139W

(C)78W

(D)117W

Answer

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Hint: The boiling point and the freezing point of an unknown scale are given. We have to find the given Celcius in terms of that unknown scale. So use the formula of the relation between the readings of two different scales and put the given data and find the required term.

Formula used:

If p be the temperature of the W scale and q be the temperature of the Celsius scale,

Then, =p−LPF of W scaleUPFof W scale−LPF of W scale=q−LPF of celsius scaleUPF of celsius scale−LPF of celsius scale

UPF means the upper fixed point and LPF means the lower fixed point.

Answer 2

Answer: There are 03 temperature scales.

   The freezing point of water in Kelvin is 273.15K and 373.15K the boiling point. ; Ice point (lower fixed point) – The temperature at which pure ice melts at one atmospheric pressure and is assigned the value of 0 °C.

First fixed point is the freezing point (ice point) of water, it is called lower fixed point (LFP). The second fixed point is the boiling point (steam point) of water, it is called upper fixed point (UFP). (2) Celsius scale : In this scale LFP (ice point) is taken 0° and UFP (steam point) is taken 100°.

Explanation:  hope it helps!!