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Solid
•characterized by good substantial quality; "solid comfort"; "a solid base hit"
•of definite shape and volume; firm; neither liquid nor gaseous; "ice is water in the solid state"
•entirely of one substance with no holes inside; "a solid block of wood"
•of one substance or character throughout; "solid gold"; "carved out of solid rock"
•uninterrupted in space; having no gaps or breaks; "a solid line across the page"; "solid sheets of water"
•hearty: providing abundant nourishment; "a hearty meal"; "good solid food"; "ate a substantial breakfast"; "four square meals a day"
•of good quality and condition; solidly built; "a solid foundation"; "several substantial timber buildings"
•firm: not soft or yielding to pressure; "a firm mattress"; "the snow was firm underfoot"; "solid ground"
•having three dimensions; "a solid object"
•impenetrable for the eye; "solid blackness"
•financially sound; "the bank is solid and will survive this attack"
•of a substantial character and not frivolous or superficial; "work of solid scholarship"; "based on solid facts"
•matter that is solid at room temperature and pressure
•upstanding: meriting respect or esteem; "an upstanding member of the community"
•the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape

Chemical Reaction
(chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water

Physical change
•phase change: a change from one state (solid or liquid or gas) to another without a change in chemical composition

Liquid
•existing as or having characteristics of a liquid; especially tending to flow; "water and milk and blood are liquid substances"
•filled or brimming with tears; "swimming eyes"; "sorrow made the eyes of many grow liquid"
•clear and bright; "the liquid air of a spring morning"; "eyes shining with a liquid luster"; "limpid blue eyes"
•a substance that is liquid at room temperature and pressure
•melted: changed from a solid to a liquid state; "rivers filled to overflowing by melted snow"
•the state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility
•smooth and flowing in quality; entirely free of harshness; "the liquid song of a robin"
•fluid matter having no fixed shape but a fixed volume
•fluent: smooth and unconstrained in movement; "a long, smooth stride"; "the fluid motion of a cat"; "the liquid grace of a ballerina"
•a frictionless continuant that is not a nasal consonant (especially `l' and `r')
•fluid: in cash or easily convertible to cash; "liquid (or fluid) assets"

Gas
•the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and ...
•a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
•gasoline: a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines
•flatulence: a state of excessive gas in the alimentary canal
•attack with gas; subject to gas fumes; "The despot gassed the rebellious tribes"
•accelerator: a pedal that controls the throttle valve; "he stepped on the gas"
•boast: show off
•natural gas: a fossil fuel in the gaseous state; used for cooking and heating homes

Surface area
•Surface area is the measure of how much exposed area a solid object has, expressed in square units. Mathematical description of the surface area is considerably more involved then the definition of arc length of a curve. ...

Concentration
•the strength of a solution; number of molecules of a substance in a given volume
•the spatial property of being crowded together
•strengthening the concentration (as of a solute in a mixture) by removing diluting material
•increase in density
•complete attention; intense mental effort
•bringing together military forces
•assiduity: great and constant diligence and attention

Enzyme
any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions

Temperature
the degree of hotness or coldness of a body or environment (corresponding to its molecular activity)