[Music]
welcome to Fahrenheit and Celsius
temperature scales most industrial
applications in the United States use
the Fahrenheit and Celsius scales for
temperature measurements each scale has
useful reference points to indicate the
temperature at which water freezes or
boils let's review the Fahrenheit scale
first Gabriel Fahrenheit a German
physicist developed the first
temperature scale in the early 1700s at
sea level water freezes at 32 degrees
and boils at 212 degrees next let's
review the Celsius scale with the
objective of developing a temperature
scale that ranges from 0 to 100 degrees
between freezing and boiling Swedish
astronomer Anders Celsius developed the
Celsius scale at sea level water freezes
at zero degrees and boils at 100 degrees
this illustration shows the freezing
point and the boiling point of water on
both temperature scales using this
differential formulas have been
developed to convert between the two
scales to determine the Celsius
temperature when a Fahrenheit
temperature is given use this formula
let's look at an example convert 65
degrees Fahrenheit to Celsius
to determine the Fahrenheit temperature
when a Celsius temperature is given use
the following formula
let's look at an example convert 10
degrees Celsius to Fahrenheit
next we'll review a few applications of
these conversions these temperature
scales are used in the measurement of
heat heat is thermal energy that has the
ability to perform work thermal energy
is rated in work units of calories and
BTUs or British thermal units the
calorie is a unit of measurement based
on the metric unit for weight in grams
and the Celsius temperature scale one
calorie is the heat required to raise
the temperature of one gram of water one
degree Celsius the BTU is a unit of
measurement based on the customary unit
for weight pounds in the United States
and Fahrenheit temperature scale one BTU
is the amount of heat required to raise
the temperature of one pound of water
one degree Fahrenheit now we're going to
work through a few examples hit the
pause button if you need time to figure
out your answer question one
the freezing temperature of water at sea
level using the Celsius scale is zero
degrees question two
the difference in temperature between
the freezing and the boiling points of
water at sea level for the Fahrenheit
scale is 180 degrees question 3
the temperature of 15 degrees Celsius is
59 degrees Fahrenheit question four
the temperature of 89 degrees Fahrenheit
is
31.7 degrees Celsius
question 5
how many calories of heat are required
to raise the temperature of two grams of
water five degrees Celsius
the answer is 10 calories 2 grams
multiplied by 5 degrees Celsius equals
10 calories congratulations you have
completed Fahrenheit and Celsius
temperature scales