# GLOSSARY

**computer model** (kuhm-PYOO-tur MOD-uhl): a computer program that is used to model something

**conceptual model** (kuhn-SEP-shu-uhl MOD-uhl): a written or illustrated explanation of how something works

**diameter** (dye-AM-uh-tur): a line segment that passes through the center of a circle and has endpoints on the circle

**dimensions** (duh-MEN-shuhnz): the length, width, and height of an object

**graphical models** (GRAF-ik-uhl MOD-uhls): two-dimensional representations of something

**key** (KEE): a chart that explains the symbols on a map

**mathematical model** (math-uh-MAT-ik-uhl MOD-uhl): an equation or equations that shows how a system or process works

**predict** (pri-DIKT): to say what you think will happen

**proportional** (pruh-POR-shuhn-uhl): having the same ratio

**ratio** (RAY-shee-oh): a comparison of two amounts using division

**representation** (rep-ri-zen-TA-shuhn): pictures or models that stand for something else

**scale model** (SKALE MOD-uhl): proportional models of an object

**scientific models** (SYE-uhn-TIF-ik MOD-uhlz): representations of an object or event that help us understand the real object or event

**simulation** (sim-yuh-LAY-shuhn): a model of an experiment