The heat in metals is conducted by the process of
The heat in metals is conducted by the process of conduction in which molecules in contact transfer heat to adjacent molecules.
Glass, plastic, wood are examples of
Those substances that do not conduct heat are called insulator. Glass, plastic and wood is examples of insulators.
During the night
During night, lands cool more quickly than sea. So, air from sea move towards the land called sea breeze.
Freezing point of water is
The temperature at which water start changing into solids is called freezing point of water.
Temperature is measured with the help of
Temperature is measured with the help of thermometer. Clinical thermometer is used to measure body temperature.
Thermos flask keeps hot liquid hot and cold liquid cold by
Thermos flask containers have two layer and there is a vacuum between two layers to prevent heat loss to keep hot liquid hot and cold liquid cool.
Heat of sun reaches to earth by
Heat of sun reaches to earth by the process of radiation as there is no medium after atmosphere to conduct heat of sun.
One gram of ice is mixed with one gram of steam. At thermal equilibrium the temperature of mixture is
Mass of ice ,
Mass of steam,
Latent heat of fusion of ice,
Latent heat of steam,
Specific heat of water,
Heat required to convert ice at 0°C to water at is
Heat released by steam at 100°C to condense into water at 100°C is
As Q1 < Q2 , whole of the steam will not condense, so the temperature of the mixture is 100°C
Conduction takes place best in
Conduction takes place in solids, liquids and gases, but works best in solids as their atoms/molecules are located closer together. Metals are the best solids for conducting heat. Metals have tightly packed atoms which can easily pass on their kinetic energy and also have free moving electrons. These electrons can move from the hot part of the metal to the colder part transferring the energy more quickly.
Ventilation in room is due to
Ventilation is extremely necessary as it circulates air in the house. In this process, convection has the major role, which takes place only in liquids and gases.
There is a constant supply of fresh air and this removes the air present before. If there was no ventilation then the room might stink and there can be a feeling of stuffiness. In the room when air is hot its density decreases and rises up. So ventilators help to move out hot air from the room and lower its temperature.