Click here to download the catalog as a PDF file. To view this site you need Adobe Flash Player and your browser must allow javaScripts. Go here to get the latest Flash Player. Pressure & Fluids You’ll get “carried away” by the excitement of this bag. A huge demonstration of thermal expansion and buoyancy. Hot Air Balloon Impressively big — but not too big to use indoors. Our reusable hot air balloon is made of very sturdy plastic film. Fill with hot air from an ordinary hair dryer, heat gun. Simply suspend weights to determine the buoyant force! Fully inflated, 8' tall and 6' wide. P1-2017 Hot Air Balloon $22 Solar Bag Use the Solar Bag to demonstrate concepts of energy, thermodynamics, density, and buoyancy! Take the 50-foot long, 3-foot diameter bag outdoors and fill it with air. Close the end, tether with string, and allow the sun’s energy to heat the air in the bag. In a few minutes, the bag begins to float! Challenge students to explain their observations using kinetic theory and gas laws. P6-7300 Solar Bag $19 Pressure Temperature Demo Quantitatively confirm the Combined Gas Law with one complete apparatus! The Combined Gas Law simplifies the Ideal Gas Law and describes a relationship between the pressure, temperature and volume of a gas that is constant. Students can verify this relationship using air and this unique apparatus. Twist the handle to compress the air, and simply read the volume, temperature and pressure from the scales. Repeat and show that the relationship stays the same. Combined Gas Law: P1 V1 T1 P2 V2 T2 “The best example of Pascal’s Principle I’ve ever seen!” —Merrill Falk-Physics Teacher Fill the syringe with water, push the plunger, and watch the water shoot out of every hole equally, even those in the back of the bulb! Dramatic and memorable! Pascal’s law: When there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container. P1-2190 Pascal’s Demonstrator $19 Boyle’s Law relates pressure and volume, and can be verified without the temperature data. Boyle’s Law: P1 V1 P2 V2 SUBSCRIBE TO How many breaths would it take to inflate an 8-foot long bag?… and why would you care? The long plastic bag nicely incorporates Bernoulli’s principle. If you were to blow it up by placing it firmly to your mouth, many lung-fulls of air would be needed. But when you hold it in front of your mouth and blow, air pressure in the stream you produce is reduced, entrapping surrounding air to join in filling up the bag. So you can blow it up with a single breath! This is especially effective after your students have counted many of their own breaths in attempting to fill up the bag! Paul G. Hewitt — Conceptual Physics (an excerpt from our CoolStuff e-newsletter) CoolStuff! Subscribe to the CoolStuff newsletter at www.arborsci.com P1-2065 P1-2064 Advanced Gas Laws Demo w/ Temperature Basic Gas Laws Demo w/o Temperature $89 $59 P6-7350 4 pack of Bernoulli Bags $6 50 1-800-367-6695