Our water heating calculator can help you determine both the amount of heat required to raise the temperature of some H2O and the time it will take. It considers the heat capacities of all three states of matter, so it also works if you want to melt the ice or boil water.
If youre wondering whats the limit of how hot water can get, what is the heat capacity, and how it all relates to your water heater BTU (British Thermal Unit) – read on!
A kettle or a boiling tap? ‘ Using a large mug of 500mls of water, we need to get from room temperature (21C) to boiling (100C) by adding energy – 165,000 Joules (or 0.046 kilowatt hours) – in the form of heat.
What is the latent heat of fusion of water?
The latent heat of fusion of water is 334,000 J/kg. Therefore, 334 J of energy are required to melt 1 g of ice at 0 °C.
How do you calculate the energy needed to heat water?
The amount of energy youll need to change the temperature of the water depends on its initial and final states. Generally, you need to consider two quantities:
- Heat required to raise the temperature, QtQ_tQt:
where:
- ccc is the specific heat capacity;
- mmm is the mass;
- TfT_fTf is the final temperature; and
- TiT_iTi is the initial temperature.
You can use volume to mass calculator instead of scales if you have, for example, a measuring jug.
This quantity is also known as sensible heat.
- Heat needed to change the phase, QpQ_mathrm{p}Qp:
where:
- LLL is the latent heat. If theres a transition from ice to water, were considering the latent heat of fusion, whereas for the phase change from a liquid into steam, its the latent heat of vaporization.
Finally, all you need to do is sum up all heat values to calculate the energy needed to heat H2O. For just one phase, youll have a single number, but otherwise, theres going to be more. Luckily, our water heating calculator takes care of it for you!
If you know the efficiency and the power of the heater, you can also compute the time required to reach the final temperature. The formula is:
where:
- QtotalQ_{text{total}}Qtotal is the total energy found earlier.
If you can measure the input and output energy, the efficiency calculator can also help.
Energy required reach the boiling temperature of water or to reach 100 Celsius.
FAQ
How many joules does it take to boil 1 gram of water?
How many joules does it take to heat water?
How much energy does it take to boil water?
How many joules of water does it take to heat energy?
How much energy do you need to boil a mL of water?
In our kitchen, we need to get those 500 mL of water from room temperature (21C) to boiling (100C) by adding energy – 165,000 Joules (or 0.046 kilowatt hours), to be precise – in the form of heat. Remember, energy comes in many forms: heat, electricity, food calories, nuclear energy, electromagnetic energy (light), etc.
How long does it take to boil 250 ml of water?
It will take around 5 minutes for the water to cool from 100 degrees to 80 degrees. ⭐At what temperature would 250ml of water boil? 250 ml of water will boil at 100 F temperature, it will boil faster than an 1 liter of water.
What temperature do you boil water at?
At sea level and standard air pressure, we have to heat water to 212 degrees Fahrenheit (or 100 degrees Celsius) before it boils. Head up to Denver, Colorado – Inside Energy’s headquarters, at 5,280 ft above sea level – and we can boil water at 203F (or 95C).