The amount of energy required to increase the temperature of a substance by 1 degree Celsius is known as its heat capacity. The heat capacity of a substance depends on its specific heat capacity, which is the amount of energy required to raise the temperature of a given quantity of the substance by 1 degree Celsius.
For water, the specific heat capacity is approximately 4.18 Joules per gram per degree Celsius (J/g°C). This means that to increase the temperature of 1 gram of water by 1 degree Celsius, you would need 4.18 Joules of energy.
So, the energy needed to increase the heat capacity of 1 gram of water by 1 degree Celsius is 4.18 Joules.