Variables in Experiments

What You'll Learn

Variables in experiments include the independent variable (what you change), dependent variable (what you measure), and controlled variables (what you keep the same).

Key Words

hypothesis
variable
control

Materials Needed

straws
paper clips
rubber bands
string

Safety First

Keep small objects away from young children.
Work in a well-ventilated area when using vinegar or other strong-smelling substances.
Dispose of materials properly after the experiment.

Steps

Step 1 — Read

Read and learn: Variables in experiments include the independent variable (what you change), dependent variable (what you measure), and controlled variables (what you keep the same).

Step 2 — Do

Follow the procedure carefully, step by step.

Step 3 — Observe

Watch carefully for any changes and note the time.

Step 4 — Record

Create a data table to organize your measurements.

Check Your Understanding

Question 1

1 of 3

What is a hypothesis?