Explain how, in general, the dew point could remain the same if the temperature rises?

Question

Please help.
I don't get this at all.

Answer 1

Dew Point (the temperature at which precipitation falls) is measured by humidity which is measured in percent. Humidity is the amount of water vapor in the atmosphere.

Temperature is the average amount of kinetic energy in the atmosphere (basically it's how hot or cold it is).

Dew Point and Temperature are completely different from their meanings. Temperature increases due to a number of reasons with the main reason being insolation (INcoming SOLar radiATION) from the sun. Dew Point increases as water vapor increases in the atmosphere.

Answer 2

"Dew point" is the "saturation temperature" of the air sample. If the sample is below freezing when that temperature is reached frost will form if that temperature is above freezing and at the surface dew and fog will form and if it occurs aloft a cloud will form.
At a fixed pressure it is an indication of the absolute amount of water in the air sample and since when heated if the pressure remains the same the amount of water in that sample will remain the same and therefore the dew point or saturation temperature will remain the same. These relationships are called "Psychrometrics" and are often expressed in the form of of a Moliere graph.
Since humidity is the percentage of moisture the air sample can hold if the pressure remains the same and temperature increases so does the amount of water the sample of air can hold therefore humidity decreases. As the temperature of the sample is lowered to the saturation temperature the amount of water in that sample is equal to the amount it can contain and the humidity is 100%
If the pressure of the air sample is decreased the dew point will increase until it reaches the ambient or dry bulb temperature of the sample and it will saturate. Since an increase in altitude is accompanied by not only a decrease in pressure but also a decrease in temperature this is the reason that a cloud can form by raising an air sample a mere few thousand feet. This is called "Adiabatic process".

Answer 3

Its all about humidity and air pressure. Look at the temp that water boils at. 212 degrees f at sea level. Thats 14.7 lbs per square inch of pressure. If you have less atmospheric pressure, the water will behave differently.

http://www.primogrill.com/boiling.htm


You also take into account the humidity in the air, how much water vapor the air is carrying. Think about a cold drink on a hot day. If the humidity is 100%, then your glass is covered with water in no time, called condensation (thats all that dew is anyway, condensation). If its not too humid, it will still condense, but not NEARLY as much, and not nearly as fast.
So you can have the same dewpoint with different temps because the pressure will cause the water to condense onto cool surfaces, and also because it is easier for the water to condense if the atmosphere is saturated (high humidity).

Answer 4

If you supply heat to the atmospheric air,the air temperature raises and if you supply moisture to the atmospheric air,dew point raises.So if you supply only heat and not the moisture,then temperature will alone rise and the dew point will remain the same.