Transcript Fahrenheit and Celsius Conversion Formulas

Fahrenheit and Celsius
Conversion Formulas
Fahrenheit to Celsius:
Celsius to Fahrenheit:
Conversion between Celsius and
Kelvin (K)
• Later when you solve problems dealing
with gases it will be important to convert
Celsius temperatures into Kelvin
temperatures by using the following
equation:
• Kelvin (K) = C° + 273
Temperature Scales
• The degree Fahrenheit (°F) is a unit of
temperature named for the german physicist
Gabriel Fahrenheit (1686 - 1736). In the
Fahrenheit scale of temperature the freezing
point of water is 32 degrees and the boiling point
is 212 degrees placing the boiling and melting
points of water 180 degrees apart. Zero degrees
Fahrenheit indicates the lowest temperature
Fahrenheit could obtain by a mixture of ice and
salt.
Temperature Scales
• The degree Celsius (°C) is a unit of temperature
named for the Swedish astronomer Anders
Celsius (1701-1744) who first proposed it. The
Celsius temperature scale was designed so that
the freezing point of water is 0 degrees and the
boiling point is 100 degrees at standard
atmospheric pressure. Since there are one
hundred steps between these two reference
points the original term for this system was
Centigrade (100 parts).
Examples
• How many degrees Celsius are 68 degrees
Fahrenheit?
Replace Fahrenheit with 68 and solve for
Celsius:
• C = (68 - 32) * 5/9,
C = 36 * 5/9,
C = 20
20 °C = 68 °F
Examples
• Convert 50ºF to ºC
• Convert 35 ºC to ºF
• Convert 98.2 ºF to ºC
(human body
temperature)
• Convert -40 ºC to ºF (yes, I
am being tricky)
Homework 9/29 and 9/30
1. Change 90° C into a Fahrenheit temperature.
2. Convert 25° C into a Kelvin temperature.
3. Absolute zero, the coldest possible temperature is equal to 0 Kelvins. What
is absolute zero on the Celsius scale?
4. What is absolute zero on the Fahrenheit scale?
5. Convert -20.0 °C to a Fahrenheit temperature.
6. A personal computer is designed to operate between 50.0°F to 104°F. What
is the temperature range on the a) Celsius scale and b) the Kelvin scale?
7. Comfortable room temperature is about 24°C. What is this temperature in a)
Fahrenheit degrees and b) Kelvins