Fundamentally, the temperature and pressure, depending on the substance. Most substances may exist in any one of those three forms under certain conditions of temperature and pressure. For example, water may exist in all three forms simultaneously (ice, liquid, vapour) under very specific conditions of temperature and pressure which are referred to as the "triple point of water".
a feather is a solid
Solid in solid: metal alloys. Liquid in liquid: vinegar dissolving in water. Gas in gas: air. Solid in liquid: salt dissolving in water. Liquid in solid: mercury absorbed by gold. Gas in liquid: carbon dioxide dissolving in soda. Solid in gas: smoke particles in air. Liquid in gas: water vapor in air. Gas in solid: hydrogen absorbed by palladium.
* solid to liquid: melting* liquid to solid: freezing* liquid to gas: vaporization* gas to liquid: liquefaction* solid to gas: sublimation* gas to solid: deposition
A solid.
solid liquid
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A gas is something that is not be liquid or solid
Matter.
Solid
A gas is something that is not a solid or a liquid like water.
When something solidifies, it turns from a gas or a liquid to a solid. The opposite of something turning from a liquid or gas to a solid would be something turning from a solid to a liquid or gas. Now, there's a word for something turning from a solid to a gas, but it's not in common use; and very few things go straight from solid to gas (dry ice is one example). So the most appropriate answer would be the word for something turning from solid to liquid, which is "liquify".
A liquid, gas or plasma.
Water I think.
Physical state refers to the form that matter exists in, such as solid, liquid, or gas. It describes whether something is hard, like ice (solid), flowing, like water (liquid), or spread out, like air (gas).
The most important factor that determines whether water is a solid, liquid, or gas is the temperature. At low temperatures, water is a solid (ice), at moderate temperatures it is a liquid, and at high temperatures, it is a gas (water vapor).
The distance between particles
evaporation solid to liquid - melting liquid to gas - evaporation gas to liquid - condensation liquid to solid - freezing solid to gas and gas to solid - sublimation