conduction - the transfer of heat through touch, radiation - the transfer of heat through waves, convection - the transfer of heat through air circulation, Atom - the basic unit of a chemical element., Proton - A small, positively charged particle of matter found in the atoms of all elements., neutron - an uncharged elementary particle that has a mass nearly equal to that of the proton, screw - simple machine of the inclined plane type consisting of a spirally grooved solid cylinder, wheel and axle - Pin or shaft on or with which wheels revolve, inclined plane - a sloping ramp up which heavy loads can be raised by ropes or chains, pulley - a wheel with a grooved rim around which a cord passes. It acts to change the direction of a force., electrons - a stable subatomic particle with a charge of negative electricity, found in all atoms,

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