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Dark matter is an invisible matter in the space that can hold the stars into the galaxy.  They have no effect of electromagnetic force on it, which means it does absorb, reflect or emit light that makes them practically invisible.

Uncertainty principle tells that the momentum and position of a particle cannot be measured precisely.

Quantum tunnelling is the process where the particle passes through an obstruction or barrier to reach at another end.  It is referred as tunnelling as the particle as “dug” out the way through the potential barrier.

When matter and light exhibits properties of both waves and particles, it is referred as Wave-Particle duality.  For instance, Light can behave like wave when it shines through narrow slits while, when exposed to some metal surface it will spray electrons acting as a particle. So under different conditions it will act.

Dyne is a unit of force or also referred as C-G-S (centimetre – gram –-second).  It means that when a force is applied to mass of 1 gram, it gives acceleration of 1 centimetre per second.

Nephelometer is the instrument used to measure the scattering of light by particles suspended in a liquid

Ohm is the unit to measure the heat resistance.

To measure the distance to nearby stars, astronomers use an effect called Parallax.  Parallax is the apparent displacement of an object because of a change in observer’s point of view, for instance, when we look at object with one eye shut and then doing the same with other eye, there is a difference in the…

The property of the material that relates to its ability to conduct heat is referred as Thermal Conductivity.

After Solid, liquid and gas there is one more matter that exists known as Plasma.  Properties of Plasma are