Sublimation Substances around us change state from solid to liquid and from liquid to gas on application of heat. But there are some that change directly from solid state to gaseous state and vice versa without changing into the liquid state. Liquid state is not present in sublimate because melting point and boiling point are …
The temperature of the system does not change after the melting point is reached, till all the ice melts.This happens even though we continue to heat the beaker, that is, we continue to supply heat. This heat gets used up in changing the state by overcoming the forces of attraction between the particles. As this …
When a solid melts, its temperature remains the same, so where does the heat energy go? Read More »
Some ice-cold water in a tumbler. Soon we will see water droplets on the outer surface of the tumbler. The water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.
In an open vessel, the liquid keeps on evaporating. The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings make the surrounding. when pour some acetone (nail polish remover) on palm, then feel cool.The particles gain energy from your palm or surroundings …
Hidden heat to change state is known as the latent heat. The word latent means hidden. The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its meltingpoint is known as the latent heat of fusion.So, particles in water at 00 C (273 K) …
During summer, we perspire more because of the mechanism of our body which keeps us cool. We know that during evaporation, the particles at the surface of the liquid gain energy from the surroundings or body surface and change into vapour. The heat energy equal to the latent heat ofvaporisation is absorbed from the body …
Bose-Einstein Condensate: In 1920, Indian physicist Satyendra Nath Bose had done some calculations for a fifth state of matter. Building on his calculations, Albert Einstein predicted a new state of matter – the Bose-Einstein Condensate (BEC). In 2001, Eric A. Cornell, WolfgangKetterle and Carl E. Wieman of USA received the Nobel prize in physics for …
Plasma: The state consists of super energetic and super excited particles. These particles are in the form of ionised gases. The fluorescent tube and neon sign bulbs consist of plasma. Inside a neon sign bulb there is neon gas and inside a fluorescent tube there is helium gas or some other gas. The gas gets …
The rate of evaporation increases with–• an increase of surface area:We know that evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. For example, while puttingclothes for drying up we spread them out.• an increase of temperature:With the increase of temperature, more number of particles get enough kinetic …
Evaporation Change of state from liquid to vapour takes place without the liquid reaching the boiling point. At a given temperature in any gas, liquid or solid, there are particles with different amounts of kinetic energy. In the case of liquids, a smallfraction of particles at the surface, having higher kinetic energy, is able to …
