melting - heat changing a solid into a liquid, melting point - the temperature at which a solid melts; 0 0C for ice., odour - smell, particle model - the model used to help describe and explain the behaviour of particles in solids, liquids, and gases, physical properties - describe things about the substance like its appearance, melting, freezing, and boiling points and its hardness, plasma - the fourth state of matter; found in sparks, lightning bolts and in stars, precipitation - any water falling from the sky, pressure - combined push of gas particles bouncing off the walls of their container, run-off - rainwater not absorbed by the soil, saturated - not able to hold any more water vapour, solidification - removal of heat, changing a liquid into a solid. Also known as freezing, state - solid, liquid, gas (also plasma at temperatures above 6000°C), vaporisation - heat changing a liquid into a gas; also known as evaporation, volume - measures how much space is occupied by a substance (units: mL or cm3), water cycle - the natural process of recycling water,

Glossary - Unit 1: What's the Matter? - Part Two

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