2007-12-08 14:26:33 · 6 answers · asked by princess_kc1 1 in Science & Mathematics ➔ Chemistry
Water will boil until you remove the heat source or until it evaporates. Boiling water stays at 100 degrees because it is the boiling point (the vapor pressure of the water equals the vapor pressure of its surroundings). Because of pressure changes, if you boil water in an airplane, the boiling point would be much lower than if you boil water at sea level. Also, if you add table salt to water, it changes the chemical composition and brings the boiling point up 1 degree.
2007-12-08 14:38:14 · answer #1 · answered by Leslie83C 2 · 1⤊ 0⤋
What is your altitude? That makes a severe difference, as the very fussy man from the east coast found out when he ordered a three-minute egg in Colorado. As the air pressure on the surface of the hot water decreases, the water will more readily gassify. Have you ever seen any of those films showing water at room temperature boiling when subjected to a vacuum?
2007-12-08 22:38:33 · answer #2 · answered by Tom 6 · 1⤊ 0⤋
water will boil as long as it takes for the liquid to evaporate.
If the temp. is below 100 C, then the atmospheric pressure must be below 1 atm.
2007-12-08 22:29:38 · answer #3 · answered by reb1240 7 · 1⤊ 0⤋
Water will boil as long as there's enough water in your vessel...water boils at about 100C if it boils below it there's a low pressure exist! other than cold substances if you place in a boiling water.
If you wish to calculate the amount of water evaporated the following equation can help you.
Heat needed by water to evaporate = mCp(T2-T1) + mHv
where:
Cp = heat capacity of water
Hv = Heat of vaporization of water
m = mass of water
From it you can calculate the amount of heat necessary to evaporate the given amount of water...
Q/A = mU (T2 - T1)
where:
Q = amount of heat
A = surface area
m = mass of your utensile
U = overall heat transfer
T2 - T1 = change in temperature of water and the temperature of the heat source...
hope it helps you.....
2007-12-08 22:40:09 · answer #4 · answered by bernie_bph 5 · 1⤊ 0⤋
the water will boil as long as adequate heat is applied or until it all evaporates. It stay at or below 100C because it must evaporate to exceed 100C. Water above 100C is always steam (at sea level)
2007-12-08 22:35:45 · answer #5 · answered by Anonymous · 2⤊ 0⤋
it takes water a while to boil due to tepmeratue
and its always 100 c because of the atomsphere.
2007-12-08 22:40:13 · answer #6 · answered by geostrom b 4 · 0⤊ 0⤋