What Is The Formula For Latent Heat Of Vaporization?

Why is latent heat of vaporization greater than fusion?

The energy required to completely separate the molecules, moving from liquid to gas, is much greater that if you were just to reduce their separation, solid to liquid.

Hence the reason why the latent heat of vaporization is greater that the latent heat of fusion..

What is the latent heat of vaporization?

When a substance changes phase, the arrangement of its molecules changes, but its temperature does not change. … Latent heat of vaporization is a physical property of a substance. It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure.

What is the heat of condensation of steam?

As the latent heat of steam at atmospheric pressure is 2257 kJ/kg the amount of flash steam produced will be 299/2257 = 0.133 kg/kg of condensate. Flash steam can be piped to an evaporator, calorifier or vat or can be used for heating in a contact heater.

Is latent heat of vaporization constant?

Latent heat of vaporization of fluids – alcohol, ether, nitrogen, water and more. The input energy required to change the state from liquid to vapor at constant temperature is called the latent heat of vaporization.

Why does water have a high latent heat of vaporization?

As a result of the network of hydrogen bonding present between water molecules, a high input of energy is required to transform one gram of liquid water into water vapor, an energy requirement called the heat of vaporization.

What is latent heat of vaporization for class 9th?

CBSE NCERT Notes Class 9 Chemistry Matter In Our Surroundings. The term latent heat of vaporisation can be defined as the amount of heat needed for the conversion of 1kg of liquid at its boiling point to gas at same temperature. It differs among different liquids.

What is Latent Heat Class 9?

The latent heat of fusion or melting of solid is the quantity of heat in joules required to convert 1 kg of solid to liquid,without any change in temperature. … The heat which is going into ice but not increasing its temperature,is the energy required to change the state of ice from solid to liquid.

How do you calculate latent heat of vaporization?

The specific latent heat is different for solid to liquid transition and liquid to gas transition. For example, if we want to turn 20 g of ice into water we need Q = 20 g * 334 kJ/kg = 6680 J of energy. To turn the same amount of water into vapor we need Q = 45294 J .

What are the two types of latent heat?

Two common forms of latent heat are latent heat of fusion (melting) and latent heat of vaporization (boiling). These names describe the direction of energy flow when changing from one phase to the next: from solid to liquid, and liquid to gas.

Does latent heat of vaporization change with pressure?

As pressure on molecules increases they require more heat to overcome the pressure force acting or to escape and thus latent heat required is more. … Thus as presure increases at 100 degree latent heat of vapourisation also increases while as pressure increases latent heat of condensation decreases.

What is the use of latent heat?

The latent heat of fusion is the heat required for an object to go from the solid state to the liquid state, or vice versa. Since its value is generally much higher than specific heat, it allows you to keep a beverage cold for much longer by adding ice than simply having a cold liquid to begin with.

What is the latent heat of fusion of water?

F-44). It is also a latent heat and is sometimes called the latent heat of fusion. It has only one value for water, because water freezes at one value (0 °C), and it is 79.71 cal/g or the rounded number 80 cal/g. The high heat of fusion of water is used in frost control.

What is latent heat of vaporization with example?

For example, when a pot of water is kept boiling, the temperature remains at 100 °C (212 °F) until the last drop evaporates, because all the heat being added to the liquid is absorbed as latent heat of vaporization and carried away by the escaping vapour molecules.

How can you detect latent heat?

latent heat of vaporisation – the amount of energy needed to evaporate or condense the material at its boiling point….Calculating thermal energy changeschange in thermal energy (ΔE t) is measured in joules (J)mass (m) is measured in kilograms (kg)specific latent heat (l) is measured in joules per kilogram (J/kg)

What is the value of latent heat of vaporization of steam?

Absolute pressureBoiling pointLatent heat of vaporizationbar°CKcal/kg0.0217.51587.610.0324.10583.890.0428.98581.1433 more rows

What is difference between sensible heat and latent heat?

Latent and sensible heat are types of energy released or absorbed in the atmosphere. Latent heat is related to changes in phase between liquids, gases, and solids. Sensible heat is related to changes in temperature of a gas or object with no change in phase.