It takes 970 B.T.U.s to change one pound of water to a gas at any temperature. So it takes 970,000 B.T.U.s to change 1,000 pounds of water to a gas. "Steam" is generally considered water when it is a "gas."
When water evaporates from your skin, from a glass, or from the ocean at it always takes with it 970 B.T.U.s per pound of water. This is true even if the water temperature is just 70F. It is not necessary for water to be heated to 212F to evaporate. Water will evaporate at any temperature so long as it is exposed to air.
Whenever water evaporates (turns into a gas) it takes with it 970 B.T.U.s per pound. If you want to boil water, it takes one B.T.U. for each degree F you raise the temperature of water till you get to 212F. Water will not get hotter than 212F at sea level until every last bit of it has turned into a gas.
The heat to transform liquid water to gas water is called the heat of vaporization, or the latent heat of evaporation. The heat to liquify water from ice is called the heat of crystalization. The heat needed to be removed from water to turn it into ice is called the heat of solidification.
Because the water's heat of vaporization is so high, water has cooling power. Outdoor misters are based on this principle. They spray a super fine mist of water into the air. Because the water in this super fine mist has a very large surface area, it evaporates at normal ambient tempemeratures. Air is hydroscopic. That means air naturally absorbs water. The less water or humidity there is in the air, the faster this process takes place.
Whenever matter changes state from solid to liquid or liquid to gas, it takes heat to break the chemical bonds.
It takes about 970 BTUs to convert 1000 pounds of water at 212°F into steam at 212°F.
It takes approximately 970 BTUs to convert one pound of water at 212°F (100°C) to steam at the same temperature.
To raise 1 pound of ice from 32°F to water at 32°F it requires 144 BTUs. Since you have 50 pounds of ice, you would need 50 * 144 BTUs to raise the ice to water at 32°F. To further raise the water from 32°F to 160°F, you would need an additional amount of BTUs based on the specific heat capacity of water.
BTU is a measure of energy, while a kilowatt is a measure of power. Energy is power times time. Energy: measured in BTU or kilowatt-hours Power: measured in BTU/hour or kilowatts. 100,000 BTU equals about 29 kWh so a 1 kW heater produces about 3400 BTU per hour.
why does steam take up more space than liquid water
It takes 8.33 BTUs to heat up one gallon of water by one degree Fahrenheit. The amount of energy needed to heat the water to a desired temperature will depend on the starting temperature and the desired final temperature.
1320 btu`s
Standard practice holds that it takes 5000 BTUs to heat a room 100 to 150 sq ft Figure on adding another 1000 BTUs for every 50 or so sq ft added. Hence , 400 to 450 sq ft would need about 10,000 BTUs
25
2250
1)This is a 5 part question. The first is realizing that 20F to 32F uses .5BTU per pound per degree. That means it takes 32-20=12*.5=6BTUs to get the ice to 32F. 2)Then you need to know the Latent Heat of Fusion for Ice which is 144BTUs (given). Lets assumes the ice changes from ice to water instantaneously at 32F. 3)Next we calculate the BTUs from 32F to 212F. Which is 1BTU per pound per degree F. 212-32=180 so it take 180BTUS. 4)Next we have to use the Latent Heat of Vaporization of water which will say instantaneously converts water to vapor. This takes 970BTUS (given). 5)Then we calculate the BTUS from 212F to 220F. Which is .5BTUs per pound per degree F which is 220-212=8*.5=4BTUs...... Finally add up all the BTUs and you get 6+144+180+970+4=1304BTUs.
That will completely depend on how much water there is.
On average it takes about 1,600 BTUs to heat 50 square feet. Multiplying 50 by 1600 equals about 80,000. Therefore, the heating plan of 1,600 square foot are would take about 80,000 BTUs.
From high school science class; it takes 144 BTUs to melt a pound of ice. That takes it to 32 degrees F. To then raise the temp to 72 deg., would take about 40 more BTUs.
If you're in Celsius, 13459.5 Btu's. If you're in Fahrenheit, 12632.5 Btu's.
1000
1000
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