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Gravitational force is the attractive force exerted by the earth on all the objects in the universe. Know more about gravitational force from CK-12 FlexBooks.

A balanced chemical equation is an equation where the number of atoms of each type in the reaction is the same on both reactants and product sides. Learn how to solve the problems related to chemical equations from CK-12 FlexBooks.

Electromagnetic spectrum, the entire distribution of electromagnetic radiation according to frequency or wavelength. Learn more about electromagnetic spectrum from CK-12 FlexBooks.

A rational number is a number that is expressed as the ratio of two integers, where the denominator should not be equal to zero. learn more about rational number from the CK-12 FlexBooks.

Compound probability is a mathematical term relating to the likeliness of two independent events occurring. learn more about compound probability from the CK-12 FelxBooks.

A piece of gold foil was hit with alpha particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space. Learn more about Rutherford gold-foil experiment from CK-12 FlexBooks.

Cellular respiration is a series of chemical reactions that break down glucose to produce ATP, which may be used as energy to power many reactions throughout the body. Learn the chemical equation for cellular respiration from CK-12 FlexBooks.

The projection of a vector on a plane is its orthogonal projection on that plane. The rejection of a vector from a plane is its orthogonal projection on a straight line which is orthogonal to that plane. Know the vector projection formula from CK-12 Flexbooks.

Air pollution is contamination of the indoor or outdoor environment by any chemical, physical or biological agent that modifies the natural characteristics of the atmosphere. Learn the types of air pollution from CK-12 FlexBooks.

If a fractional coefficient has been used, multiply both sides of the equation by the denominator to obtain whole number coefficients. Learn more about balancing chemical equations from Ck-12 FlexBooks.