You must have seen that water vapour starts to condense in an air conditioner. Why?

The AC is leaking, call a mechanic.

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The temperature at the AC is lesser than the dew point temperature.

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The temperature at the AC is more than the dew point temperature.

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It is so hot outside, I don't even wanna be reminded of ACs

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Solution

The correct option is B The temperature at the AC is lesser than the dew point temperature.
Yes, one of the jobs of the air conditioner is to lower the humidity! It does this by reducing the temperature of pipes running within it below the dew point, hence you see the AC dripping more on a humid day (If you ask an expert in ACs she would say it is sweating!)

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Similar questions

Q. Dew point temperature is the temperature at which condensation begins when the air is cooled at constant

Q. The moisture content of a gas is often expressed in terms of the dew point. The dew point is the temperature to which the gas must be cooled before the gas becomes saturated with water vapour. At this temperature, water or ice (depending on the temperature) will be deposited on a solid surface. Dew point of

H_{2} O

- 43^{0} C

at which vapour pressure of ice formed is

0.07 m m

. Assuming that the

C a C l_{2}

owes its desiccating properties to the formation of

C a C l_{2} \cdot 2 H_{2} O

, calculate :
(i)

K_{p}

at that temperature of the reaction,
(ii)

Δ G

C a C l_{2} (s) + 2 H_{2} O (g) ⇌ C a C l_{2} \cdot 2 H_{2} O (s)

Q. You must have seen that water vapour starts to condense in an air conditioner. Why?

The temperature and the dew point in an open room are 20°C and 10°C. If the room temperature drops at 15°C, what will be the new dew point?

BOOK ANSWER : 10°C

MY SUGGESTION :

My answer is also same as book because I think that dew point do not depend on environment temperature.

But I want to know that the reason I have mentioned is true or not, if my reason is wrong then why?

The temperature and the dew point in an open room are $20^{0}$ C and $10^{0}$ C. If the room temperature drops to $15^{0}$ C, what will be the new dew point ?

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