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Determine the relative humidity from the information given below.

Temperature +25°C 
Dew point +15°C

  • A

    25%

  • B

    50%

  • C

    65%

  • D

    85%

To determine the approximate relative humidity, you can use the dew point and air temperature values. The relative humidity (RH) represents the amount of moisture present in the air relative to the maximum amount of moisture the air can hold at a given temperature.

One way to calculate the approximate relative humidity is to use the following formula:

  • RH = 100 - [(T - Td) x 5]

Where "Td" stands for the dew point temperature in degrees Celsius, "T" stands for the observed temperature in degrees Celsius, RH is the relative humidity in percent. This equation is accurate for humidity values above 50 percent.


RH = 100 - [(25 - 15 x 5] = 50%

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