1.6 Temperature Conversion

Temperature

Temperature is a measure of how hot or cold object is. It is defined as measure of average kinetic energy of the particle. In scientific world, 

three Temperature scales are used. Fahrenheit, Celsius and Kelvin.

T_f= 1.8Tc + 32        Tk= Tc + 273  

-273.15 degree Celsius is defined as absolute zero temperature. This is the lowest possible temperature theoretically possible in this universe. As temperature decreases, all energy of matter decreases as degrees of molecular and atomic motion decreases. A matter is expected to have all motion frozen at absolute zero temperature.

Figure: 1.21 Different Scales of Temperature

Watch the following video:

xample Problem:

State the Temperature on the Celsius Thermometer and convert into Fahrenheit scale.

Celsius: 61.5^oC  

Applying the formula: Tf= 1.8Tc+ 32

1.8*61.5 +32= 142.7= 143^oF

Applying the formula: Tf= 1.8Tc+ 32

155=1.8Tc +32  

155-32= 1.8Tc,  

1.8Tc=123  

Tc= 68.3 oC

Tk= Tc+273= 341.3K

Questions:

1. Why is the number 1.8 (and not some other value) used in the formula for converting between Celsius and Fahrenheit temperatures?

2. Convert the following Fahrenheit temperature into Celsius and kelvin

1. 12⁰F
2. 32⁰F
3. 40⁰F
4. 212⁰F