Hot
Is boiling water always hot ? If not, why not ?
Labels: funphysics, outside-the-box, thinktank
posted by Rajesh Lal at
9:15 PM
Monday, September 1, 2008
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16 Comments:
Hot and cold are relative
How “hot” does something have to be in order for it to be considered hot? How “cold” does it have to be for something to be considered cold?
Absolute zero is pretty cold. The sun is pretty hot…however, there is no upper limit bound to “hot”
~Cybersurf~
No it does not. If you put water in a vacuum chamber it will boil as long as it's liquid to start with. The same is true with every liquid.
I think the correct answer is "No" It's not always hot. Water can appear to boil with a chuck of "Dry Ice" Though that is really just it Turning into it's gaseous form.
turtlesoup is right. water does not need to be hot to boil, in fact it can be ice cold. take boiling water and put it into a container and seal it. then pour ice water over it repeatedly. boiling water is a matter of pressure, not temperature.
MILO says...
NO, it can be boiling water, with liquid nitrognen, then it will bol, and be cold as heck!
also if the area around the boiling water was much hotter then it would feel cold.
Yanonmous
Is boiling water always hot?
I never realized that the act of boiling water is sexy. I thought it was a mundane chore done when you have to clean something or cook pasta.
Ok, maybe if your boyfriend is in his boxers and he tries boiling water as he cooks pasta for you, then yeah, that could be HOT.
Out of the box power!
No, if there is only a tiny tiny, like tiny amount of water, there will be temperature of 100 degrees, but not much heat energy. . .
bravo White Elf
Out of the box rocks
Any liquid will boil if the pressure is low enough.
On a mountain where the air pressure is low, water boils at
less than 212 F. Which means food may not cook as well.
if you are sea level water boils at 212
if u are below sealevel it has to be hotter
if you are extreamly above sealevel like on the largest mountain the temperature that the water boils at is low...
the same thing inside a Pressure cooker!
water boils at 100 degrees when at sea level, take the water up a hill and it boils at a slightly lower temperature, so the higher above sea level the water is the lower the boiling point would be and eventually one would be able to reach a point where the water was boiling, but at a temperature where it would not be considered hot.
Hot and cold are relative terms, however, when speaking about things in reference to ourselves, things become hot when we can no longer touch them without our skin burning.
So no, boiling water is not always hot.
i believe boiling is always hot. i think some people are getting boiling confused with bubbling i.e. the dry ice and water bubbles, not boils. boil refers to when something is hot and a change occurs in the matter i.e. its state. boiling and freezing are two VERY different things just like how hot and cold are opposites.
Erm...I can see where you guys are coming from with the points about the terms "hot" and "cold" being relative to the person, but the answer is no. The water when boiling is also cooled by the constant evaporation and air bubbles being produced when the water is being heated (you could also read up on superheated water whereby the water gets so hot it stops bubbling)
no, you can boil water and the walk away from it.
Liquids boil when the vapor pressure of the liquid matches that and exceeds atmospheric pressure.
So, if you remove the pressure of the atmosphere (say, a vacuum) then it will boil.
Boiling is a pressure AND temperature specific function, but more so pressure. At a higher pressure, you need more temperature to create more molecules going into the vapor state of the gas-liquid equilibrium of all liquids. This increases the vapor pressure, and eventually it matches atmospheric pressure and boils.
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