If girlfriend wear glasses you have probably had this happen to girlfriend today. You go from the nice, cool, air-conditioned inside to the sauna-like conditions outside and your glasses fog increase so you can barely see with them.Let"s to speak the temperature indoors is 72 degrees. If you room inside because that a while, her glasses will cool to the temperature.Then you action outside. Today in Louisville, the dew suggest is skies high at 76 degrees. This is what the temperature needs to be because that the humidity to it is in 100%. For this reason if the glasses temperature is 72 and the dew allude is higher, the waiting hitting the glass surface condenses instantly when you walk outside. This will continue to occur until your glasses warmth to a temperature over the dew point.For me a little while ago it take it a couple of minutes because that the glasses to clear out. The greater the dew point, the much longer it will certainly take because that the glasses to clear.If the dew suggest was under 72 degrees when girlfriend stepped out of the air conditioning, then the glasses would certainly not fog up.Or if you choose it really warm inside... Let"s say 78 degrees.... If the dew point is under 78 then there will certainly be no fogging.It is the same in the winter, just reverse. You go from the cold air exterior into a warmth building and until your glasses warmth to over the at home dew point, then her glasses will certainly fog up. However, the air is generally pretty dry inside throughout the winter. Generally the dew points indoors space in the 30"s so the would have to be chillier than that external for your glasses to fog increase going inside._________________________________________________________________________Today we space seeing some exceptionally high dew points end western Kentucky.At Cadiz the dew point has got to 82 degrees which is really rare to go the high.Louisville has had a 76 dew point for numerous hours. As soon as the temperature is in the 80"s a 76 dew suggest will result in a warm index about 10 come 11 degrees over the air temperature.If the temperature is in the 90"s, a 76 dew suggest adds 11 to 14 levels to the temperature to obtain the warmth index.The highest dew suggest ever in the U.S. Was 91 at new Orleans.In the world, Saudi Arabia has actually seen dew points up to 95 degrees.Dew point is a measure of moisture in the air.If the is 65 levels in the morning and the dew point is 60... That offers you a humidity the 88% and also you can think.... Wow! the is yes, really humid.However, on John"s dew point chart... A 60 dew point is on the very low end of starting to feel a small humid in the summer.Later in the job the temperature rises to 90 degrees and also the dew point stay s 60 which means there is quiet the exact same amount of humidity in the air....barely ~ above the lower end of emotion humid. These numbers would offer you a humidity that 38%. So compared with the morning you will think, it is not too humid out and also yet that is the exact same amount of humidity in the wait from the morning. Warmer air can hold much more moisture. The is why the humidity value dropped.In the summer.... Always use dew suggest to see how humid that is.... Perform not use humidity.Dew suggest in the 50"s = COMFORTABLE60-65 = A small HUMID65-70 = HUMID70-75 = OPPRESSIVE75-80 = SAUNA-LIKE

If girlfriend wear glasses you have actually probably had actually this take place to friend today. You go from the nice, cool, air-conditioned inside to the sauna-like problems outside and your glasses fog increase so you have the right to barely see v them.

You are watching: Why do glasses fog up when going from cold to hot

Let"s to speak the temperature at home is 72 degrees. If you are inside because that a while, your glasses will certainly cool to the temperature.


Then you action outside. This particular day in Louisville, the dew allude is sky high at 76 degrees. This is what the temperature has to be because that the humidity to be 100%. So if the glasses temperature is 72 and also the dew allude is higher, the waiting hitting the glass surface condenses instantly when you walk outside. This will continue to happen until her glasses warmth to a temperature over the dew point.

For me a small while earlier it took a couple of minutes because that the glasses to clean out. The higher the dew point, the much longer it will take for the glasses to clear.

If the dew point was under 72 levels when you stepped the end of the waiting conditioning, climate the glasses would certainly not fog up.

Or if you favor it really warm inside... Let"s to speak 78 degrees.... If the dew suggest is under 78 then there will certainly be no fogging.

It is the very same in the winter, just reverse. You go from the cold air external into a warm building and until your glasses warm to above the indoor dew point, then your glasses will certainly fog up. However, the air is typically pretty dry inside throughout the winter. Normally the dew clues indoors room in the 30"s so the would need to be chillier than that outside for your glasses to fog increase going inside.

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Today we are seeing some very high dew points end western Kentucky.

At Cadiz the dew allude has reached 82 degrees which is very rare come go the high.Louisville has had actually a 76 dew allude for number of hours. When the temperature is in the 80"s a 76 dew suggest will result in a warm index about 10 come 11 degrees over the waiting temperature.If the temperature is in the 90"s, a 76 dew suggest adds 11 to 14 degrees to the temperature to acquire the warmth index.

The highest possible dew allude ever in the U.S. Was 91 at new Orleans.

In the world, Saudi Arabia has seen dew points as much as 95 degrees.

Dew suggest is a measure up of moisture in the air.

If the is 65 degrees in the morning and also the dew allude is 60... That provides you a humidity the 88% and also you could think.... Wow! that is yes, really humid.However, on John"s dew point chart... A 60 dew point is ~ above the very low end of beginning to feeling a little humid in the summer.

Later in the work the temperature rises to 90 degrees and the dew suggest stay s 60 which way there is still the very same amount of moisture in the air....barely ~ above the lower end of feeling humid. These numbers would offer you a humidity of 38%. So contrasted with the morning you will certainly think, that is not as well humid out and yet that is the exact same amount of humidity in the wait from the morning. Warmer air deserve to hold more moisture. That is why the humidity worth dropped.

In the summer.... Always use dew allude to see just how humid it is.... Perform not use humidity.

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Dew point in the 50"s = COMFORTABLE

60-65 = A tiny HUMID

65-70 = HUMID

70-75 = OPPRESSIVE

75-80 = SAUNA-LIKE


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