Students read how to determine and calculate the dry density for a given sample of soil or aggregate based on the mass-volume relationship.

Students read how to determine and calculate the dry unit weight for a given sample of soil or aggregate based on the weight-volume relationship.

Learners answer questions about foundry-related technology and terms using a game board format. This learning object can be used individually, in small groups, or as a class activity to provide an alternative self-assessment tool.

Explore how to collect a fresh or dry blood specimen and prepare it for the crime lab.

Vapor pressure is the pressure exerted by molecules in the gas phase in equilibrium with a liquid or a solid. Two examples are used to illustrate vapor pressure: the drying of clothes and the evaporation of ice.