Physics

Heat is transferred in the liquid and gases from a region of higher temperature to a region of lower temperature. Convection heat transfer occurs partly due to the actual movement of molecules or due to the mass transfer.

Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.

The temperature at which water boils depends mainly on air pressure.

Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is invisible.

Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.

The polarization phenomenon, verifies the transverse nature of light.

When a body moves about a mean position in such a way that the acceleration is proportional to the displacement and is always directed towards the mean position, the body is said to execute a simple harmonic motion. The motion of a simple pendulum falls under this category.

Pyrometer is best suited for measuring the temperature inside metallurgical furnaces.

The light of distant stars is affected by interstellar dust and the Earth’s atmosphere.