Property - What is being observed or measured of an object. Examples: temperature, melting point, density, Unit - The standard way that a property is measured. It tells you how big or small something is. Examples: inches, miles, mm, cm, grams, pounds, liters, Variable - A factor you want to change or control in an investigation, Independent Variable - The variable to change because you want to test it (there should only be one), Dependent Variable - The variable that is observed or measured , Controlled Variable - The variable to keep the same, Thermometer - Property = Temperature; Units = C or F, Mean - The average of a set of numbers, Digital Scale - Property = mass or weight; Units = grams, Molecule / Particle - the smallest part of a substance, Solid - particles are close together and can't move freely, Liquid - Particles are a little close together and can move more freely, Gas - Particles are not close together and can move freely, Kinetic Energy - How fast or slow the particles move,

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