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Roxy
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How do you know if something is a solid, liquid or gas. Like ferrous iodide or sodium phosphate?
chem_tr said:Physical state may change upon temperature, pressure and even time...
I think chem_tr may be referring to non-equilibrium (metastable) states.dextercioby said:Could you please give an example of a phase trasition of the first kind in which,assuming a system in one phase (e.g.solid) and nonmodifying the external conditions (temperature,pressure and other parameters),the system would undergo a phase transition (into e.g.fluid)??
Daniel.
dextercioby said:Could you please give an example of a phase trasition of the first kind in which,assuming a system in one phase (e.g.solid) and nonmodifying the external conditions (temperature,pressure and other parameters),the system would undergo a phase transition (into e.g.fluid)??
Daniel.
Gokul43201 said:I think chem_tr may be referring to non-equilibrium (metastable) states.
HungryFox said:Milk. Milk turns into powder over time.
Matter is anything that takes up space and has mass. It can exist in three states: solid, liquid, or gas.
A solid has a fixed shape and volume, a liquid has a fixed volume but takes the shape of its container, and a gas has neither a fixed shape nor volume.
The physical properties of a substance, such as its shape, volume, and ability to flow, can help identify its state. For example, solids are usually hard and maintain their shape, while liquids can flow and take the shape of their container, and gases are able to expand and fill their container.
Yes, substances can change states through physical processes such as melting, freezing, evaporation, and condensation. These changes in state are reversible, meaning the substance can go back to its original state under the right conditions.
The state of matter can be affected by temperature and pressure. Generally, increasing the temperature will cause a substance to change from a solid to a liquid to a gas. Decreasing the temperature will have the opposite effect. Changes in pressure can also cause substances to change states, such as when water boils at a lower temperature at higher altitudes due to decreased air pressure.