some solids diffuse in liquids but not in gases ,some solids diffuse in gases but not in liquids.why
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Some solids diffuse in liquids but not is gases some solids diffuse in gases but not in liquid why?
“Solid diffuse in liquid” is more commonly known as solid (solute) dissolving in a liquid(solvent) forming a solution. It depends on the chemical properties of solute/solvent pair, whether they are going to form a solution together or not. A rule of thumb is “Like dissolves in Like”, ionic and bipolar solutes like to dissolve in ionic or polar solvents (what. Common table salt dissolves in water).
On the other hand some solids transition from solid to gas without forming liquid. This process is called sublimation. For example naphthalene, camphor etc sublime in thin air. To understand this phenomenon, we need to know about vapor pressure. All liquid substances remain surrounded by the gaseous form of its own molecules at any temperature. The pressure exerted by just these molecules is called vapor pressure. At temperatures, below the boiling point of the liquid phase of most substances, vapor pressure is below the incumbent atmospheric pressure. With the addition of heat, more and more molecules go into gaseous form and the vapor pressure builds up. When the vapor pressure equals the incumbent atmospheric pressure, the liquid starts to boil and form gaseous phase. That temperature is called the boiling point of the substance. Not only liquids, solids can have vapor pressure as well, and when the vapor pressure of this solid substance exceeds the incumbent atmospheric pressure it simply vaporizes without forming a liquid. The solid doesn’t melt because its just not hot enough to melt before it vaporizes without forming a liquid.
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