Simple Hydraulics Classroom Kit: Pascal's Principle

What's Included:

6 student group sets, each including:

(2) large syringes (60 mL)

(2) small syringes (10 mL)

(2) 2-foot lengths of tubing with Luer lock connections

Frequently Asked Questions

What is the Simple Hydraulics Classroom Kit?

The Simple Hydraulics Classroom Kit is a six-group set of syringes and Luer-lock tubing for teaching Pascal's Principle, fluid pressure, and mechanical advantage through hands-on student labs rather than demonstration alone.

What topics can I teach with this kit?

Pascal's Principle and pressure transmission in a confined fluid, the difference between pneumatic and hydraulic systems, force and pressure as a function of piston area, mechanical advantage, and real-world applications like car brakes, hydraulic lifts, and heavy equipment. The kit also supports the Hydraulics Lab: Pascal's Principle activity and pairs with other investigations in 6 Fluids Experiments for AP Physics.

What's included in the Simple Hydraulics Classroom Kit?

The kit includes six student group sets. Each set contains 2 large syringes (60 mL), 2 small syringes (10 mL), and 2 two-foot lengths of tubing with Luer lock connections.

How many students does one kit support?

Six groups work simultaneously, so one kit covers a class of roughly 18 to 30 students at two to five students per group. Larger sections can run the labs in stations or share a second kit.

What grade levels or courses is this best for?

Upper elementary through high school. Younger students focus on the observable behavior of air versus water in the system, while high school physics, physical science, and STEM/engineering classes add the quantitative work of calculating area, pressure, and mechanical advantage.

Do I need anything else to run the labs?

Just water and paper towels. A ruler or caliper is useful for measuring syringe barrel diameters. A ring stand and a hooked mass set extend the labs into measured-load work, but they are not required for the core activities.

Why run both the air and water versions?

Air compresses and water does not, and students feel that difference immediately. The pneumatic setup gives a spongy, delayed response; the hydraulic setup transmits motion almost instantly. Running both back to back is what makes the incompressible-fluid assumption behind Pascal's Principle concrete instead of something students take on faith.

How do students calculate mechanical advantage with this kit?

Students measure the barrel diameters of the large and small syringes, calculate the piston areas, and take the ratio. Pairing a 60 mL syringe with a 10 mL syringe produces a clear, measurable force multiplication that students can predict first and then verify by pushing against the system. Connecting two same-size syringes gives a 1:1 control case for comparison.

How do I keep air bubbles out of the hydraulic setup?

Fill the syringes and tubing under water and work the plungers a few times to purge trapped air before connecting. Trapped bubbles are the most common reason a hydraulic run behaves like the pneumatic one, so it is worth showing students the fill technique once at the start rather than troubleshooting six stations later. The bubbles themselves also make a good teaching moment about compressibility.

Is the kit reusable, and how should I store it?

Yes. The syringes and tubing are reusable across sections and school years. Drain and air-dry the components before storing, and keep the Luer-lock ends clean so the connections stay tight. Nothing in the kit is consumable.

Does it include instructions or a teacher guide?

Yes. The Hydraulics Lab: Pascal's Principle guide walks through the full activity sequence: initial measurements and area calculations, Lab 1 on pneumatic motion, Lab 2 on hydraulic motion with water, and Lab 3 on mechanical advantage using different syringe sizes.

Can students collect quantitative data for lab reports?

Yes. The graduated barrels let students record volume displacement directly, and measured diameters give them the areas needed to calculate pressure and predicted force ratios. Comparing predicted to observed results gives students a real source of experimental error to discuss, which works well for AP Physics 1 lab write-ups.

How does this compare to Pascal's Vases?

Pascal's Vases shows that fluid pressure depends on depth rather than container shape, as a front-of-room demonstration. This kit covers pressure transmission and force multiplication in a closed system, with every student working hands-on. They cover different halves of the fluid-pressure unit and work well together.