temperature scale

2. TEMPERATURE

3. What is temperature?
Temperature is a measurement of how
hot or cold something is.
The S.I. unit for temperature is Kelvin and is
represented by the symbol K.
However, for practical reasons, most
thermometers measure temperature on the
Celsius scale.

4. MEASURING TEMPERATURE
• Instruments to measure temperature:
A laboratory thermometer can
measure temperatures between –
10  C to 110  C.
A thermocouple can measure
temperatures from –200  C to 1200
 C.
An infrared thermometer allows us to
measure temperatures from a
distance (–55  C to 280  C)
A digital thermometer displays the
temperature on a digital display
(32.0  C to 41.1C)

5. Thermometer and Its Scale
There are four kinds of
thermometer scale; Celsius,
Fahrenheit, Reamur, and
Kelvin.

6. Temperature Scale Conversion
Are scale value conversion between boiling and melting point at
thermometer from celsius, fahrenheit, reamur, and kelvin.
The conversion of Celsius, Fahrenheit, Reamur, and
Kelvin thermometer scales
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7. The conversion formula for a
temperature that is expressed on the
Celsius (C) scale to its Reamur (R)
representation is:
TC = 5/4 x TR
TR = 4/5 x TC

8. EXAMPLE
The temperature of an object is
600R. What is its temperature in
celsius?

9. The conversion formula for a
temperature that is expressed on the
Celsius (C) scale to its Fahrenheit (F)
representation is:
TF = 9/5 x TC + 32
TC = 5/9 x (TF – 32)

10. R – F
TR= 4/9 (TF-32)
TF=9/4 TR+32

11. EXAMPLE
If the reading of a Celsius
thermometer is 700C, then the
reading on Fahrenheit scale is ….

12. • TF = 9/5 x 70 +32
• TF = 9x14 +32
• TF = 126 +32
• TF = 158 0F

13. EXAMPLE
If the reading of a Fahrenheit
thermometer is 1130F, then the
reading on Celsius scale is ….

14. TC = 5/9 (113-32)
TC = 5/9 x 81
TC = 5 x 9
TC = 45 0C

15. The conversion formula for a
temperature that is expressed on the
Celsius (C) scale to its Kelvin (K)
representation is:
TC = TK - 273
TK = TC + 273

16. EXAMPLE
If the reading of a Kelvin
thermometer is 203 K, then the
reading on Celsius scale is ….
TC = 203 – 273
TC = - 70 0C

17. EXAMPLE
If the reading of a Celsius
thermometer is 700C, then the
reading on Kelvin scale is ….
TK = 70 +273
TK = 343 K

18. HEAT (KALOR)
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