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The amount of energy to boil water depends on two things: the amount of water and the temperature of the water when you start.

The more water water, the more energy it takes. The colder the water, the more energy it takes.

Let say the water is at room temperature, or 20 °C. First, the water must be heated to 100 °C, which takes energy. The amount of energy is given by the specific heat of water, which is 4.186 Joule/gram °C. That means that requires 4.186 Joules of energy to heat 1 kilogram of water by 1 °C. So if you have 1 kilo grams of water at 20 °C, you have to add this much energy:

= (4.18Joule/gram °C) (100g) (100 °C - 20 °C)

= 334400 joules/°C

Of course, if you had more or less water, or it was colder or warmer, you would adjust this equation accordingly..

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Q: How much energy is needed to boil water?

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It depends on the starting temperature.

Water doesn't boil until 216 degrees. So any amount of energy won't work at 100 degrees

No, it requires much more energy to boil water than to melt the same mass of ice (around 7 times as much).

Depends how much water and the temperature of the water. To heat 1 mL of water by 1 degree C 1 cal of energy (4.184 Joules) is required. Assuming that the water is at 25 degrees C, to boil one litre (liter) of water you would require 75,000 cal or 313.8 kJ. Or 16.74 g of mars bar ;). In terms of solar energy a 180 watt solar panel would take just under half an hour to gather enough energy to boil a litre of water from 25 degrees C (provided it's receiving maximum sunlight of course.

Until now, conveniently measuring the correct amount of water to be boiled in your kettle has not been easy. It is estimated that, on average, we boil twice the volume of water needed every time. Which means twice as much energy, twice as much time. An eco kettle allows you to boil just the right amount of water every time.

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It depends on the starting temperature.

Water doesn't boil until 216 degrees. So any amount of energy won't work at 100 degrees

No, it requires much more energy to boil water than to melt the same mass of ice (around 7 times as much).

Specific heat capacity water - 4.187 kJ/kgK4.187 kJ/kgK * 10'K * 1Kg = 41.87 Kj

From 22 degrees room temperature in a perfect world in a vacum, 3276kJ. Pure water From 22 degrees room temperature in a perfect world in a vacum, 3276kJ. Pure water

Depends how much water and the temperature of the water. To heat 1 mL of water by 1 degree C 1 cal of energy (4.184 Joules) is required. Assuming that the water is at 25 degrees C, to boil one litre (liter) of water you would require 75,000 cal or 313.8 kJ. Or 16.74 g of mars bar ;). In terms of solar energy a 180 watt solar panel would take just under half an hour to gather enough energy to boil a litre of water from 25 degrees C (provided it's receiving maximum sunlight of course.

Until now, conveniently measuring the correct amount of water to be boiled in your kettle has not been easy. It is estimated that, on average, we boil twice the volume of water needed every time. Which means twice as much energy, twice as much time. An eco kettle allows you to boil just the right amount of water every time.

none

The needed energy is 10 calories.

The needed energy is 10 calories.

I boil about 4 cups water.

The energy required to boil water will depend upon the starting temperature of the water, your location above or below sea level, and the mass of water being boiled. This is because the boiling point of a substance is when its vapor pressure equals the pressure surrounding the liquid.

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