One BTU is the amount of heat energy required to raise one pound of water by 1ºF. Water weighs 8.33 pounds per gallon so we can calculate that one gallon of water requires 8.33 BTU to raise the temperature 1ºF.
How much energy does it take to boil water?
Phase changes in pure water occur at a specific temperature. At 1 atm, water freezes at 0° C and boils at 100° C. The energy required to change water from a liquid to a solid is 333.7 kJ/kg while the energy required to boil water is 2257 kJ/kg.
How much energy does it take to boil water calculator?
The specific heat capacity of water is 4.18 J/g/°C. We wish to determine the value of Q – the quantity of heat. To do so, we would use the equation Q = m•C•ΔT. The m and the C are known; the ΔT can be determined from the initial and final temperature.
How much energy does it take to boil 1 Litre of water?
Based on the above answers and examples, to boil 1 litre of water from 20C to 100C, requiring 0.183 kWh of either electricity or gas, at todays energy prices GAS is 68% cheaper than electricity.
How much energy does it take to boil water in Watts?
It boils in half the time as the first cup boiled in either the microwave or the stove. Since (at 1450 Watts) it uses about the same amount of power as the others, halving the time halves the energy. Thereafter, the energy requirement for boiling larger volumes of water is nicely predicted by a linear function.
Does boiling water release energy?
VAPORIZATION When water reaches its boiling point of 100ºC, water molecules are moving so fast that they break free of the attractions that hold them together in the liquid state. … CONDENSATION When steam is cooled, it releases thermal energy and turns into its liquid state. This process is called condensation.
How much energy is required to boil 150g water?
= 150 g x 4.184 J/g/K x (373 – 298) K = 47,070 J. Thus, 47,070 J are needed to increase the temperature of 150 g of water from 25 degrees C to its boiling point of 100 degrees C.
How much does it cost to boil a gallon of water?
It is generally accepted that it costs about 1¢ to 2¢ to heat a gallon of water. The exact amount will depend on the efficiency of your water heater, whether you use gas or electric and exactly what your electric or gas costs are.
Why is energy needed to boil water?
Boiling water is an endothermic process, which supplies heat to the water molecules, increasing their potential energy. The applied heat causes the water molecules to move further away from each other without causing any increase in overall temperature.
What is the cheapest way to boil water?
If it’s full of limescale, you use more energy to boil the same amount of water. Because gas is cheaper than electricity, it works out slightly cheaper to boil water on a gas hob than using an electric kettle, as long as you are boiling just the quantity you need and switch off the hob as soon as it has boiled.
Do rapid boil kettles use more electricity?
If you don’t wait to wait for the freshly brewed coffee in the morning, choose the kettle that comes with rapid boiling. Some energy-saving kettle has a lower wattage than a standard electric kettle. However, it will save money, but the water will take more time to boil.
What boils water faster gas or electric?
Winner: electric. Boiling speed. In comparison tests, gas stoves are almost always slower to boil a pot of water than an electric stove with the same BTU rating. This is probably because a lot more heat escapes with gas (see below).