NEMO-Chemistry
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Hot Day cold acid!
Today in the UK was hottest day of the year, around 2pm it dawned on me that my large container of HCl might benefit from being put in a bucket of
cold water in the garage.
Its too big for the fridge at 5 Ltrs, so i went to pick it up and noticed the outside had condensation on it!
Its from a decent source and the container has a great seal on, the bottle didnt look like it was under pressure but touching the outside the bottle
felt welt and cold!
The wet was water.
Why was/is this, its totally against what i would expect, outside temp was 31c woohoo, garage temp around 17C container temperature 5c!
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wg48
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Its condensation.
The humidity has been high here in the UK. At such times condensation will form any object that about 10C or more lower than the air temperature. It
formed on the floor of the north facing extension of my house and any objects on it. See the attached graph.
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NEMO-Chemistry
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Quote: Originally posted by wg48  | Its condensation.
The humidity has been high here in the UK. At such times condensation will form any object that about 10C or more lower than the air temperature. It
formed on the floor of the north facing extension of my house and any objects on it. See the attached graph.
|
Thanks it just felt strange feeling the acid container being so cold and yet in a room that was warmer, but makes sense the evaporation of the
condensation cooled down the container
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NEMO-Chemistry
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The garage is great, seems well shaded so even in these temps the inside isnt that hot, even my pet ether seems ok in its box
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Texium
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Psh, I'd happily take 31ºC in the afternoon at this time of year... it's been near 40 and humid for most of this month. I've become a nocturnal
creature.
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wg48
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| Quote: Originally posted by NEMO-Chemistry | | Quote: Originally posted by wg48 | Its condensation.
The humidity has been high here in the UK. At such times condensation will form any object that about 10C or more lower than the air temperature. It
formed on the floor of the north facing extension of my house and any objects on it. See the attached graph.
|
Thanks it just felt strange feeling the acid container being so cold and yet in a room that was warmer, but makes sense the evaporation of the
condensation cooled down the container |
No. Condensation heats the objects that are initially cold
The garage and in particular its floor and objects on the floor tend to be at an average temperature ie lower than the day time temperature. So your
bottle of acid is initially colder than the outside air during the day. Its been around 70% RH during the day (100% at night hence the dew on grass).
If you look at the graph the dew point is less than 10C below the air temperature so any cool objects get condensation on them which heats them up
until equilibrium is reached.
The condensation problem is worse at the moment because the heat spell has only been a few days so the average temperature is much lower than the day
time temperatures and garage floors tend not to be insulated just like the stone cottage I live in.
[Edited on 20-7-2016 by wg48]
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NEMO-Chemistry
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| Quote: Originally posted by wg48 | | Quote: Originally posted by NEMO-Chemistry | | Quote: Originally posted by wg48 | Its condensation.
The humidity has been high here in the UK. At such times condensation will form any object that about 10C or more lower than the air temperature. It
formed on the floor of the north facing extension of my house and any objects on it. See the attached graph.
Ah ok i understand now, it also gives me a good idea how to build a dew point propagator  .
Everyone been moaning in the UK because it hit30C, stupid because a couple of weeks time everyone will moan its cold.
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Thanks it just felt strange feeling the acid container being so cold and yet in a room that was warmer, but makes sense the evaporation of the
condensation cooled down the container |
No. Condensation heats the objects that are initially cold
The garage and in particular its floor and objects on the floor tend to be at an average temperature ie lower than the day time temperature. So your
bottle of acid is initially colder than the outside air during the day. Its been around 70% RH during the day (100% at night hence the dew on grass).
If you look at the graph the dew point is less than 10C below the air temperature so any cool objects get condensation on them which heats them up
until equilibrium is reached.
The condensation problem is worse at the moment because the heat spell has only been a few days so the average temperature is much lower than the day
time temperatures and garage floors tend not to be insulated just like the stone cottage I live in.
[Edited on 20-7-2016 by wg48] |
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