The dew point temperature is 6°C when the difference between wet-bulb and dry-bulb temperatures is 4°C and the dry-bulb temperature is 14°C.
To calculate the dew point temperature, a table is used instead of a formula. To determine the dew point temperature the dry-bulb temperature (which is 14°C in this case) on the left side of the table is noted and then the difference between wet-bulb and dry-bulb temperatures, i.e. 4°C is noted given on the top of the table. Now the cell where these row and column meet gives the value of the dew point temperature, which comes out to be 6°C.
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