The time interval in which a substance exists as both liquid and solid is called ; Triple point
A triple point is a time interval in a substance when the pressure and temperature of the substance causes the substance to exist in more than one phase at a time. Substances that exhibit this characteristic are called non-Newtonian fluids.
A good example of a substance that exist in both liquid and solid form within this time interval is Potassium.
Hence we can conclude that the time interval in which a substance exists as both liquid and solid is called triple point.
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