A porcelain evaporating dish with a flat bottom is a laboratory container used for evaporation and drying of liquids. It is typically made of porcelain, a type of ceramic material that is able to withstand high temperatures and chemical corrosion. The flat bottom design provides stability and allows for easy heating on a hot plate or over an open flame.

Evaporating dishes are commonly used in chemistry, pharmaceuticals, and other laboratory applications where the evaporation or drying of liquids is required.

The porcelain construction of the evaporating dish provides durability and resistance to chemical corrosion, making it a cost-effective solution for evaporation and drying in laboratory settings.