high school

Amount and rate of heat transfer using iron spheres and liquid nitrogen

When iron spheres at room temperature are added to liquid nitrogen, the nitrogen boils as heat is transferred in from the iron. The amount of liquid nitrogen boiled depends on the amount of heat transferred, which depends on the mass of the iron added. However, the rate at which liquid nitrogen boils depends on the surface area of the iron in contact with the liquid nitrogen. These phenomena can be studied with experiments which measure the mass lost by the boiling liquid nitrogen.

The Importance of Words

The meaning of chemistry vocabulary may seem obvious to the teacher, but we cannot assume that students have the same understanding.