All terms in this list:

Matter: Anything that has mass and volume. Matter exists ordinarily as a solid, a liquid, or a gas.

Mass: A measure of how much matter an object is made of.

Mixture: A combination of two or more substances that do not combine chemically but remain the same individual substances. Mixtures can be separated by physical means.

Molecule: A group of atoms that are held together by covalent bonds so that hey move as single unit.

Volume: An amount of three-dimensional space, often used to describe the space that an object takes up.

Weight: The force of gravity on an object.

Atom: The smallest particle of an element that has the chemical properties of that element.

Element: A substance that cannot be broken down into a simpler substance by ordinary chemical changes. An element consists of atoms of only one type.

Compound: A substance made up of two or more different types of atoms bonded together.

Gas: Matter with no definite volume and no definite shape. The molecules in a fas are very far apart, an the amount of space between them can change easily.

Heat: 1. The flow of energy from an object at a higher temperature to an object at a lower temperature.
2. Energy that is transferred from a warmer object to a cooler object.

Liquid: Matter that has a definite volume but does not have a define shape. The molecules in a liquid are close together but not bound to one another.

Kinetic Theory of matter: A theory stating that all matter is made of particles in motion.

Solid: Matter that has a finite shape and a definite volume. The molecules in a solid are in fixed positions and are close together.

States of Matter: The different forms in which matter can exist. Three familiar states are solid, liquid, and gas.

Temperature: A measure of the average amount of kinetic energy of the particles in an object.

Thermal Energy: The energy an object has due to the motion of its particles; the total amount of kinetic energy of particles in an object.

Displacement: The quantity of anything, as water, displaced by a floating body, as by a ship, the weight of the displaced liquid being equal to that of the displacing body.