acid - a chemical, usually a liquid, that contains hydrogen and has a pH of less than seven., air bubble - a ball of air that is surrounded by a liquid or by soft or frozen material:, chemical reaction - a process in which the structure of atoms or molecules that make up a substance are changed, explosion - the fact of something such as a bomb exploding:, gas - a substance in a form like air that is neither solid nor liquid:, gravity - the force that attracts objects towards one another, especially the force that makes things fall to the ground:, jug - a container for holding liquids, laboratory - a room or building with scientific equipment for doing scientific tests, liquid - a substance, such as water, that is not solid or a gas, pressure - the force you produce when you press something:, temperature - the measured amount of heat in a place or in the body:, test tube - ​enlarge imagea small glass tube, closed at one end, that is used in scientific experiments, thermometer - an instrument used for measuring the temperature of the air, a person’s body, etc.,

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