how hot dose water have to be to boil?

Answer 1

212 degrees Fahrenheit and 100 degrees Celsius but that changes at high altitudes.

All cooking processes are directly affected by atmospheric pressure. At sea level, water boils at 212º F, but on mountaintops and other high-altitude regions, the boiling point is much lower. For about every 500 feet of ascent, the boiling point is lowered 1ºF. At a 7,000 foot elevation, water would boil at about 198º F. Because the water is boiling at a lower temperature, it would take longer to cook food by boiling.

The boiling point can also be expressed in the lesser-known measurement called Kelvin, where the boiling point is 373 degrees Kelvin..

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Answer 2

short answer: It can vary!

Long answer:

The standard 212°F or 100°C are for "standard pressure", or 1 atm, which is generally at sea level.

Pressure varies with elevation and weather. The higher your elevation, the less atmosphere is above you, thus the pressure is less. Lower pressure means a lower boiling point, which is why some recipes specify that you have cook things longer at high elevtaions. At high pressures water can reach a higher temperature before boiling, which is why pressure cookers cook faster.

Here's a nifty calculator that factors in current barometric pressure (that can be obtained from your source for current weather conditions) along with elevation on the boiling point of water.

http://www.biggreenegg.com/boilingPoint.htm#pressure

So, at the moment for my location, (1093 ft elevation and 30.26 inches of mercury) water is estimated to boil at 210.6°F

Answer 3

It depends on your elevation.

At sea level: 212 Degrees Fahrenheit, 100 degrees Celsius, 373.15 Kelvin or 671.69 degrees Rankine.

As elevation increases, the boiling point will decrease. (i.e. at 1 mile above sea level the boiling point of water is approximately 202.5 degrees Fahrenheit.)

For science purposes, boiling point is always considered to be the boiling point at sea level.

Answer 4

At sea level, 212F or 100C.

As the altitude rises, so does the boiling point of water. But if you're looking to make coffee, don't let the water get above 180F or 82C. Black tea needs boiling water, but green tea and herbal teas need slightly cooler water.

Answer 5

Water boils at 212 degrees.

Answer 6

It has to reach the temperature of 100 degree centigrade which is also known as boiling point.

Answer 7

standard at 0 altitude is 212 degrees F or 100 degrees C, if you are not at 0 altitude then go to my link below!

Answer 8

It varies a little based on altitude and purity.
The generally accepted values are 100° C and 212° F.

Answer 9

212 degrees

Answer 10

100 degrees celsius, you will know if it's boiling by looking at it and see if there are steams coming out