DEFINITION OF CONCEPTS

RADIATION: If the number of neutrons in the atomic nucleus are greater than the number of protons, instability occurs in the nucleus and the excess neutrons get broken. During that time, alpha, beta and some invisible rays emerge. These rays are named radiation.

SOLAR PANEL: It is an energy source that contains many solar cells to absorb the sun lights.Then, the energy is converted to the electric energy.

SPECIFIC HEAT: The amount of heat required to increase the temperature of the unit weight of a pure substance by 1 degree Celsius. It is indicated by ''c''. It is a distinctive feature of the substance.

GRAVITY: Gravity is the phenomenon of the planets, stars pulling the objects and the celestial bodies near them, to the center of the objects on them. It is a kind of pulling force of the planets.

ABSORPTION: It is a process which retains (radiation, sound, wave etc) completely, without reflextion or transmission.

ROTATIONAL KINETİC ENERGY: It is a kind of kinetic energy that occurs during the object's rotation. It is a part of total kinetic energy.

GAS PRESSURE: It is a kind of pressure which is formed as a result of the gas molecules continuously colliding with the inner walls of the container. If the temperature and number of the molecules are stable, the pressure is inversely proportional.

ENERGY DENSITY: It is amount of energy stored in a given system per unit volume. It is one of the energy efficiency indicators. For fuels, energy per unit volume is a useful parameter.

TRANSLATIONAL MOTION: It is a movement of the object that never changes direction relative to a fixed point.

PRESSURE COEFFICIENT: It is a dimensionless number that defines the relative pressures along a flow field in fluid dynamics. That number is used in hydrodynamics and aerodynamics. For a fluid flow field, every point has a unique pressure coefficient.