In this activity, which variable will be changed?

In this activity, which variable will be changed?

• A. volume
• B. pressure
• C. velocity
• D. temperature

Answer: (B)

The activity is designed so that the action you perform changes the pressure inside a closed system. When you apply a force or adjust the piston (the mechanism that exerts force on the contained fluid or gas), the force per area inside increases or decreases, so the pressure reads differently. Volume is typically held constant in this setup (or changes only as a consequence, not as the main manipulation), and velocity or temperature aren’t the variables you’re actively varying or measuring in this particular task. So the observable variable that changes in response to your manipulation is pressure.

The activity is designed so that the action you perform changes the pressure inside a closed system. When you apply a force or adjust the piston (the mechanism that exerts force on the contained fluid or gas), the force per area inside increases or decreases, so the pressure reads differently. Volume is typically held constant in this setup (or changes only as a consequence, not as the main manipulation), and velocity or temperature aren’t the variables you’re actively varying or measuring in this particular task. So the observable variable that changes in response to your manipulation is pressure.