Precipitation can occur in two distinct ways, depending on whether convection is involved or not.
Convection is a rapid mass movement of a fluid, and gases like the atmosphere are fluids. Fluid refers to both gases and to liquids. So, if a large volume of air move upwards rapidly, and this were to trigger precipitation, the precipitation is said to be convective.
Nonconvective precipitation occurs when precipitation occurs without this rapid mass air uplifting.
In both cases the cloud usually contains both liquid water and ice, and they are both in the same part of the cloud simultaneously.
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