What is meant by latent heat?

What is meant by latent heat?

Latent heat, energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature. The latent heat is normally expressed as the amount of heat (in units of joules or calories) per mole or unit mass of the substance undergoing a change of state.

What is latent heat of fusion explain with example?

For example, the amount of energy absorbed by ice to become water is equal to the amount of energy liberated by water to become ice. The latent heat of fusion of a substance also accounts for the energy required to accommodate any increase in the volume of the substance post the change of its physical state.

How do you solve latent heat of fusion?

Find the latent heat of fusion, Lf, according to Lf = q ÷ m by dividing the heat, q, absorbed by the ice, as determined in step 3, by the mass of ice, m, determined in step 4. In this case, Lf = q / m = 2293 J ÷ 7.0 g = 328 J/g. Compare your experimental result to the accepted value of 333.5 J/g.

What is the equation for latent heat?

The specific latent heat (L) of a material… is a measure of the heat energy (Q) per mass (m) released or absorbed during a phase change. is defined through the formula Q = mL. is often just called the “latent heat” of the material.

Does water have a high latent heat of fusion?

The heat of fusion of water is unusually high. 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.

What is the unit of sensible heat?

Joule

What is sensible heat in HVAC?

Sensible heat is what registers on your thermostat. It reflects a temperature change. Technically speaking, sensible heat refers to the amount of energy needed to increase or decrease the temperature of some substance, independent of phase changes (like a gas-to-liquid phase change).

What is the delta T in HVAC?

“Delta T” is the most common use of the word delta in the HVAC industry, meaning temperature difference. If the temperature before a cooling coil is 75F and the temperature after the cooling coil is 55F, subtract 55F from a 75F to find a delta t of 20F.

Can Delta P be negative?

1 Answer. Truong-Son N. Pressure is NEVER negative, ever. It is always, always positive (you cannot “un-apply” pressure or impart “negative energy”), and in the case of pressure-volume work, in most cases the external pressure is constant and it is the internal pressure that might change.