a. There are two different scales used for measuring temperature. The

Fahrenheit scale, which is the most common, has the boiling point of water as 212F

and the freezing point of water as 32F. The Centigrade (Celsius) scale, which is used

in the sciences, has the boiling point of water as 100C and the freezing point of water

as 0C.

b. The storage temperature of drugs that require refrigeration is normally

expressed in degrees Centigrade. Many of the temperature gauges used in

refrigerators are graduated in degrees Fahrenheit. At times, it is necessary to calculate

a change from one scale to the other.

The following formula works for converting both ways; that is, conversions can be

made from Fahrenheit to Centigrade or from Centigrade to Fahrenheit using this

formula:

5F = 9C + 160

To work the above formula, the following algebraic principles must be understood:

a. When bringing a number from one side of an equation to the other

(transposition), the sign must be changed. For example: To place the +l60 on the left

of the formula, simply change it to a -160 and transpose:

5F = 9C + 160

5F - 160 = 9C (Both formulas have equal value)

b.

When adding like signs, simply add and keep the same sign. For example:

(+160)

+

(+100) = +260

(-160)

+

(-100) = -260

MD0802

1-27

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