## What is Centre of Mass? Differences with Centre of Gravity

In physics, the centre of mass distribution in space is the distinctive point where the weighted relative position of the mass distribution corresponds to zero. This is the point where force can be applied to induce linear acceleration without angular acceleration. The centre of the body’s mass is the position that changes as the forces … Read more

## What is Centre of Gravity?

In physics, the centre of gravity is an arbitrary location in a body of matter where the total weight of the body can be assumed to be concentrated for simplicity in some calculations. The centre of gravity is identical to the centre of mass, in a uniform gravitational field. And still, not always do the … Read more

## What is Capacitor?

A capacitor is an instrument that stores electrical energy in an electrical field. It is a passive, two-terminal, electronic component. The capacitor effect is known as capacitance. Although some power occurs in proximity in a circuit between any two electrical conductors, a capacitor is a device designed to add capacitance to a circuit. The capacitor … Read more

## What is Candela?

Candela (cd) is a luminous intensity unit within the Standard Unit System (SI). Described as the luminous intensity of a source emitting monochromatic radiation, in a given direction. In measurements involving artificial illumination the candela has replaced the traditional candle or lamp as a measure of luminous intensity and is often considered the “new candle.” … Read more

## What is Brownian Motion?

Brownian motion is the unpredictable motion of suspended particles in a medium. This motion pattern usually consists of spontaneous variations within a fluid subdomain in the direction of an object, accompanied by a displacement to another subdomain. The motion was named after the botanist Robert Brown who first described the phenomena in 1827 and saw … Read more

## What is Boltzmann constant?

Max Plank introduces the Boltzmann constant, and is named after Ludwig Boltzmann. It is a physical constant which is obtained by taking the ratio of two constants, namely gas constant and Avogadro’s Number. The Boltzmann constant values are obtained by the division of gas constant R by the Avogadro’s Number. The Value of Boltzmann constant … Read more

## What is Contact Binary?

Contact Binary is a type of Binary Star. Contact Binaries: Tidal forces will get into play when two stars are similar in separation. Since stars are not solid bodies but rather gases, gravity will strip material from one star to the other. Thus we conclude the binaries are in contact, even though their surfaces do … Read more

## What is Spectroscopic Binary?

Spectroscopic Binary is a type of binary star. Another way to calculate star masses is to measure their relative velocities by moving their spectral lines via the Doppler. This is seen where the pair can not be resolved as a visible binary, but movement is used in the one-star spectra. You don’t need to see … Read more

## What is Atto?

Atto denotes a unit one-quintillionth (10−18) the size of the unit named by the stem. Atto (a) is a unit prefix denoting a variable of 10−18 or 0.0000000000000001 in the metric system. The unit multiple was introduced in Resolution 8 at the 12th General Weights and Measures Meeting. It comes from the Danish word atten … Read more

The number 6.022 × 1023 representing the number of atoms or molecules in a mole of any substance is called the Avogadro’s Number. One of the basic constants of chemistry is Avogadro’s Number. It helps one to compare the various atoms or molecules of the given substances where they have the same number of atoms … Read more

## What is an Atom?

An atom is the smallest unit to break an element into without losing its chemical identity. Atoms consist of a large central nucleus surrounded by a swarm of electrons or negatively charged particles. The nucleus comprises both positive (protons) particles and electrically neutral (neutrons) particles. The number of protons is called the number of atoms. … Read more

Background radiation is a measure of the amount of ionizing radiation found in the atmosphere at a given site and is not attributable to intentional radiation sources being added. Background radiation comes from a number of natural as well as artificial sources. Both rocks and soils contain trace quantities of natural radioactivity, which can be … Read more

## What is Apparent Magnitude?

Astronomers use the term apparent magnitude to explain how luminous an object is from Earth in the sky. The idea of a scale of magnitude goes back to Hipparchus, who invented a scale to explain the brightness of the stars that he could see. He awarded the brightest stars in the sky an apparent magnitude … Read more

## What is Antiparticle?

Antiparticles are subatomic particles that have the same mass as one of the regular matter particles but the electric charge and magnetic moment are different. And the positron (positively charged electron) is the antiparticle of the electron that is negatively charged. Like the regular neutron, the spinning antineutron has a net electrical charge of zero … Read more

## What is Big Bang Theory?

The Big Bang Theory is a cosmological concept of the observed universe and its subsequent large scale evolution from the earliest known times. The model explains how the universe evolved from an initial state of intense high density and high temperature, which gives a detailed explanation for a vast variety of observable observations including the … Read more

## What is Atomic Number?

The number of protons in a nucleus is called the atomic number, and the number of electrons in orbit around the nucleus is usually equal. Both atoms that have the same number of protons-the atomic number-are also atoms of the same element. Atomic Number, also expressed by the symbol Z, the number of protons in … Read more