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There are about 2.5 centimeters (cm) in one ____. battery
A proton and a neutron have about the same ____ (1 amu). condensation
The process of a gas changing to a liquid is ____. inch
A ____ is a little more than a quart. kilogram
The study of light is called ____. liter
A ____ converts chemical energy into electrical energy. mass
A ____ is about 2.2 pounds (lb). optics
A ____ is subatomic particle with a single positive charge. proton

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