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What is a process

Operations that involve a physical or chemical change.

What is an input

Materials that enter the process (feed)

What is an output

Materials that leave the process (product)

Types of process variables

Mass and Volume

What is density

Mass per unit volume

What are the units of density

grams cubic centimeter, kilogram cubic centimeter, pound mass cubic feet

What is specific volume

volume per unit mass

Units of specific gravity

cubic centimeter grams, cubic centimeter kilogram, cubic feet pound mass

How density and specific gravity relates

Are conversion factors that relate mass and volume

Densities of pure solids or liquid change in T or P

They do not change very much.

Densities of gases change in T or P

They do change often

Definition of specific gravity

Ratio of the density (P) of the material to the density of a reference material (water)

What is mass and volumetric rate

Rate at which a material is transported through a process line.

Unit of mass flow rate

kilograms per second

Unit of volumetric flow rate

cubic meters per second

How mass and volumetric flow rate are related

By the density of fluid.

What is chemical composition

Refers to mixtures. Physical properties depend strongly on the content of each component (composition).