the basic unit of a chemical element, also known as the building block of matter

two or more atoms held together by chemical bonds

anything that has mass and occupies space

a combination of two or more substances that are not chemically combined

A measure of how much matter is in an object

a measure of the amount of space an object takes up

horizontal distance between the crests or between the troughs of two adjacent waves

the number of complete wavelengths that pass a point in a given time

the energy associated with the motion and position of everyday objects

the total energy of all the particles of an object

energy carried by an electromagnetic wave

potential energy that depends on the height of an object

a form of potential energy that is stored in chemical bonds between atoms

form of heat transfer where heat energy is directly transferred between molecules through molecular collisions or direct contact.

the transfer of thermal energy by the circulation or movement of a liquid or gas

the transfer of energy by electromagnetic waves

a region of the electromagnetic radiation spectrum where wavelengths are longer than visible light; humans cannot see these but feel them as heat

process by which energy or matter penetrates an object's surface and is taken in by that object

to return light, heat, sound, and so on, after it strikes a surface

The potential energy stored in the nucleus of an atom

A wave that requires a medium through which to travel

waves that can travel through a vacuum (empty space)

a measure of the strength or intensity of a wave

a measure of how much of the Sun's energy is reflected off an object back out to space

a force that holds atoms together