Question: What Is Latent Heat Class 9?

What does latent heat cause?

Latent heat.

All pure substances in nature are able to change their state.

Solids can become liquids (ice to water) and liquids can become gases (water to vapor) but changes such as these require the addition or removal of heat.

The heat that causes these changes is called latent heat..

What is latent heat used for?

The latent heat of vaporization is the thermal energy required for a liquid to vaporize to a gas or the amount that is released when a gas condenses to a liquid. Water has a high latent heat of vaporization, which is why steam burns are so dangerous.

What is Latent Heat Short answer?

Latent heat: The heat energy which has to be supplied to change the state of a substance is called its latent heat. … Latent heat does not increase the kinetic energy of the particles of the substance, so the temperature of a substance does not rise during the change of state.

What are 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.

What is the symbol of latent heat?

Specific latent heat Q is the amount of energy released or absorbed during the change of phase of the substance (in kJ or in BTU), m is the mass of the substance (in kg or in lb), and. L is the specific latent heat for a particular substance (kJ kg−1 or in BTU lb−1), either Lf for fusion, or Lv for vaporization.

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.

What is L in latent heat?

Specific latent heat (L) is defined as the amount of thermal energy (heat, Q) that is absorbed or released when a body undergoes a constant-temperature process.

What is sublimation class 9th?

Class 9 Chemistry Matter In Our Surroundings. Sublimation. Sublimation. The phenomenon of change of solid directly to gas or conversion of gas directly to liquid without changing into liquid state is called sublimation. For instance, camphor also called capoor when kept for a long time vanishes.

What is latent heat and its types?

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.

What is an example of latent heat?

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.

Can you measure latent heat?

The temperature of the material during the phase change does not change and hence it is in thermal equilibrium with anything it is in contact with, like a thermometer. Thus a thermometer cannot measure any temperature change when heat is supplied during phase change, otherwise known as latent heat.

What is latent heat in science?

Latent heat. physics. Last Updated: See Article History. Latent heat, energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature.

What is Latent Heat formula?

Formula for Latent Heat The formula for latent heat is: Q = m * L. This equation relates the heat Q that must be added or removed for an object of mass m to change phases. The object’s individual latent heat is noted by L. The unit of latent heat is J/kg.

What is latent heat transfer?

The transitions between a material’s solid, liquid and gaseous phases involve large amounts of energy. The energy required for the transition is known as latent heat transfer. Recently, alternative energy researchers have been looking at ways that this latent heat transfer can be used to store energy until needed.

What is entropy formula?

Derivation of Entropy Formula Δ S \Delta S ΔS = is the change in entropy. q r e v q_{rev} qrev = refers to the reverse of heat. T = refers to the temperature in Kelvin. 2.

What is melting point Class 9?

NCERT Class 9 Science Lab Manual – Melting Point of Ice and Boiling Point of Water. … Melting Point: The temperature at which the solid changes into liquid at the atmospheric pressure is called melting point. For example, ice melts at 0°C to form water.

What is latent heat of vaporization for Class 9?

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 are three types of latent heat?

Types of Latent Heat. There are three phases of the substance: solid, liquid and gaseous. … Latent heat of fusion: Let us suppose we have one kg of ice and we have to convert it into water, the amount of heat required to do this is called as latent heat of fusion.