Definition - What does Miscible mean?

Miscible is a term which refers to fluids that mix easily and form homogeneous mixtures. Miscible oil is usually a hydrocarbon oil that contains emulsifiers. The oil forms a milky emulsion when mixed with water. Miscible can also be termed as the capability of mixing two liquids in any ratio, while there is no separation between two phases.

Petropedia explains Miscible

Liquids are only termed as miscible if they completely mix to form a homogeneous mixture. If a significant proportion doesn’t dissolve, then they are not termed as homogeneous mixtures. For example consider water and butanol. Butanol is significantly soluble in water but not completely soluble and hence it is not miscible. Few miscible liquids are water and ethanol, water and alcohol, water and aldehydes, HCl and NaOH etc.

This can also be understood as the polarity concept. Two liquids with same polarity will mix to form a homogeneous solution and hence will be termed as miscible liquids. The most common example of immiscible solution is oil and water.

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