Question

On Fahrenheit scale, the boiling point of water is:
A. 100$^\circ $F
B. 80$^\circ $F
C. 212$^\circ $F
D. 32$^\circ $F

Answer 1

Hint: We need to know about the boiling point and its values in different scales of temperature. The boiling point of liquid is the temperature at which the vapor pressure of the liquid is equal to the pressure around the liquid. At this temperature, the liquid starts to boil and the temperature remains constant until the entire volume of the liquid converts into gas. There are three temperature scales used. These are Fahrenheit ($^\circ $F) scale, Celsius ($^\circ $C) scale and Kelvin (K) scale.

Complete step by step answer:
We know that the boiling point of water in the Celsius scale is 100$^\circ $C. It is the most convenient scale for measuring temperature as more handy devices for measuring temperature such as thermometers shows the temperature is the Celsius scale.
There exists a formula which can be used to convert the given temperature from Celsius scale to the Fahrenheit scale and vice versa.
Formula for converting Celsius to Fahrenheit: $F = (C \times 1.8) + 32$
Formula for converting Fahrenheit to Celsius: $C = (F - 32) \times 1.8$
Since the boiling point of water in the Celsius scale is 100$^\circ $C, therefore using the formula for the conversion of temperature from the Celsius scale to the Fahrenheit scale, we can find the boiling point of water can be calculated in the Fahrenheit scale.
$C = 100$
Formula for converting Celsius to Fahrenheit:
$F = (C \times 1.8) + 32$
$F = (100 \times 1.8) + 32$
$F = 180 + 32$
$F = 212$
Therefore, On Fahrenheit scale, the boiling point of water is $212^\circ F$.

So, the correct answer is Option C.

Note: It must be noted that the above data is applicable for pure water only. If a solute is added to the water, particularly a non-volatile solute, the boiling point is likely to increase. The boiling point is 212 degree Fahrenheit at standard atmospheric pressure only which is approximately 760mmHg or 1atm. At 10,000 feet above sea level, the pressure of the atmosphere is only 526mmHg. At these elevations, water boils when its vapor pressure is 526mmHg, which occurs at a temperature of 90 degree Celsius.