Joseph is an HVAC technician and a hobbyist blogger. He’s been working as an HVAC technician for almost 13 years, and he started blogging just...Read more

The latent heat of steam at atmospheric pressure is the amount of heat energy required to change one gram of water from a liquid state to a gas state. The water vapor in the air is constantly exchanging energy with its surroundings, and this process is known as evaporation. When water vaporizes, it absorbs a large amount of heat from its surroundings, which explains why our bodies feel cooler when we perspire on a hot day.

The latent heat of steam at atmospheric pressure is the amount of heat required to change 1 gram of water from a liquid to a gas. The Latent heat of steam can be found in the Steam Table under the “Latent Heat” column. For water at atmospheric pressure, the latent heat of steam is 2260 kJ/kg.

## What is the Latent Heat of Water to Steam?

The latent heat of water to steam is the amount of energy required to change one gram of water into one gram of steam. The value is usually given in joules (J) or calories (cal).
The latent heat of vaporization is the amount of energy required to change the state of water from a liquid to a gas.

The value is usually given in joules (J) or calories (cal). For water, the latent heat of vaporization is 2260 J/g or 539 cal/g.
The specific latent heat of vaporization is the latent heat divided by the mass.

For water, the specific latent heat of vaporization is 2.257 kJ/kg or 0.544 kcal/kg.

## What is Latent Heat in the Atmosphere?

In the atmosphere, latent heat is released when water vapor condenses into liquid water or ice. This process is called latent heat of condensation. It plays an important role in regulating Earth’s climate.

Latent heat is a type of energy that is stored in a substance but is not released until the substance changes state. For example, when water vapor in the atmosphere condenses into liquid water droplets, it releases latent heat. This release of energy warms the air and helps to drive atmospheric circulation.

Latent heat can be either positive or negative. Positive latent heat indicates that more energy is required to change the state of a substance (such as water vapor) than would be required if the change of state were reversible. Negative latent heat indicates that less energy is required to change the state of a substance than would be required if the change of state were reversible.

The most important type of latent heat in the atmosphere is latent heat of condensation. This occurs when water vapor in the air condenses into liquid water or ice crystals. As it does so, it releases large amounts of energy into the surrounding air, which warms the air and drives atmospheric circulation patterns such as weather fronts and jet streams.

## Does Steam Have Latent Heat?

Yes, steam has latent heat. This is the heat that is released when water vapor condenses back into liquid water. The latent heat of vaporization is the amount of energy required to change one gram of water from a liquid to a gas.

For water, this value is about 2,260 joules/gram (J/g). When steam condenses back into liquid water, it releases this same amount of energy in the form of heat.

## Does Latent Heat Increase With Steam Pressure?

Latent heat is the heat that is released or absorbed by a substance during a change of state. The latent heat of vaporization is the heat required to transform a unit mass of liquid into vapor without raising its temperature. The latent heat of fusion is the heat required to melt a unit mass of solid without changing its temperature.

The latent heat of vaporization increases with steam pressure because the molecules are closer together and require more energy to overcome the attractive forces between them.

## Dry Steam | Wet Steam | Latent Heat | Sensible Heat | Critical Point | Dryness Fraction

## Latent Heat of Steam Formula

Latent heat of steam is the heat required to change water into steam without raising the temperature. The latent heat of steam can be calculated using the following formula:
Latent Heat of Steam = (Boiling Point of Water – Temperature) x Latent Heat of Vaporization

where Boiling Point of Water is the boiling point of water at atmospheric pressure (100°C or 212°F), Temperature is the temperature of the water, and Latent Heat of Vaporization is the heat required to change 1 kg (2.2 lb) of water into steam at atmospheric pressure (2264 kJ/kg or 972 Btu/lb).

## Latent Heat of Vaporization of Steam in J/Kg

When water is heated, it will first begin to boil and turn into steam. However, the temperature of the steam will not continue to rise until all of the water has been converted into steam. This is because water must first overcome the latent heat of vaporization in order to change states from a liquid to a gas.

The latent heat of vaporization is the amount of energy that must be added to a liquid in order to convert it into a gas. For water, this value is 2260 J/kg. This means that it takes 2260 Joules of energy to convert 1 kilogram of water into steam.

The latent heat of vaporization plays an important role in many applications involving steam. For example, when steam is used to power turbines in power plants, this latent heat must be taken into account in order to ensure that the turbines are operating at their most efficient level. Additionally, the latent heat of vaporization can be used for cooling purposes.

When evaporative coolers work by using evaporation to remove heat from air, they are actually taking advantage of the fact that it takes energy (in the form of latent heat) to convert liquid water into steam.

## Latent Heat of Vaporization of Water

Water has a very high latent heat of vaporization. This means that it takes a lot of energy to convert water from a liquid to a gas. The latent heat of vaporization is the amount of energy required to change the state of matter from a liquid to a gas.

For water, this value is about 2,260 joules per gram. (1) That’s a lot of energy!
It takes so much energy to vaporize water because the molecules in liquids are held together by strong intermolecular forces.

When water is heated, the molecules move faster and have more kinetic energy. However, they are still attracted to each other by these strong forces. In order for water to evaporate, or change states from liquid to gas, the molecules must overcome these intermolecular forces.

This requires a lot of additional energy, which is why the latent heat of vaporization is so high.
The latent heat of vaporization can be harnessed in practical ways. One example is using steam turbines in power plants.

Water is boiled in large tanks and the steam that results powers turbine generators which create electricity.(2) Another common application for this property of water is found in clothes dryers. Hot air circulating in the dryer provides enough energy to overcome the intermolecular forces holding water molecules together in wet clothes.

(3) As the water changes states from liquid to gas, it removes heat from the clothing and helps them dry faster!
Now that you know all about how much energy it takes to vaporize water, you can appreciate all the hard work your clothes dryer does next time you use it!

## Steam Tables

A steam table is a table that shows the properties of water and steam at different temperatures. The most common steam tables are the saturated steam tables and the superheated steam tables. These tables are used to determine the pressure, temperature, specific volume, enthalpy, and entropy of water and steam.

The saturated steam table shows the properties of water andsteam at saturation conditions. The superheatedsteam table shows the properties ofsuperheatedsteam. Superheatedsteam issteam that is heated above its boiling pointat a constant pressure.

## Conclusion

The latent heat of steam at atmospheric pressure is 2,257 kJ/kg. This value is derived from the first law of thermodynamics and represents the amount of energy required to change one kilogram of water into steam. The latent heat of steam is also referred to as the enthalpy of vaporization or the heat of vaporization.

Joseph is an HVAC technician and a hobbyist blogger. He’s been working as an HVAC technician for almost 13 years, and he started blogging just a couple of years ago. Joseph loves to talk about HVAC devices, their uses, maintenance, installation, fixing, and different problems people face with their HVAC devices. He created Hvacbuster to share his knowledge and decade of experiences with people who don’t have any prior knowledge about these devices.

More Posts