Tag: evs - i

According to Kirchhoff's law of radiation, good absorbers are good emitters. A black spot is a better absorber than the shiny surface, so it will emit more radiation and appear brighter when the object cools in a dark room.

Compressed natural gas is used in vehicles and is a cheap source of fuel.

The kinetic energy of particles is maximum in gas as the particles are free to roam with maximum speed as there is negligible force of attraction between the particle.

Liquefied petroleum gas is used for cooking food at the homes.

Thermal conduction takes place in all the states of matter as the energy is transferred through particles so transfer of heat takes place.

The three phases of water are ice (present in solid state),  water (present in liquid state) and steam (present in the gaseous state).

Oxygen and nitrogen are gases, bromine is liquid at room temperature. So $KMnO _4$ is solid at room temperature.

Particles move randomly in a gaseous state. Here nitrogen is the only substance which is in a gaseous state.

Iron has the highest density as the particles are closely packed and volume occupied is less which makes the density very high.

The general order of force of attraction is Solid > Liquid > Gas.