Complete Master List for #200 Diving Into Pressure and Buoyancy - PDF:
Key: (1st/2nd/3rd) denote needed quantities: (1st) enough for 1 student doing all activities; (2nd) for 30 students working in self-paced pairs; (3rd) for 30 students working in pairs on the same lesson. Starred* items may be purchased below.
- 1/15/15: 2-liter plastic soda bottles with tight-fitting lids (clean, labels removed)
- 1/1/1: water source
- * 1/15/15: glass eyedroppers, available from TOPS (see Notes A1 for specifications)
- 0.5/8/8: feet waxed dental floss
- 1/2/8: scissors
- * 3/17/20: straight plastic straws (avoid very wide ones)
- 1/15/15: towels, rags, or sponges to wipe up spills
- 1/2/4: paper punch tools
- 1.1/17/17: meters string (heavier than kite string and lighter than cord)
- * 3/30/45: craft sticks or tongue depressors
- * 1/5/15: thick rubber bands (not likely to break when pulled hard)
- * 1/5/15: thin rubber bands
- * 1/15/15: inches clear tape
- 1/1/1: access to cool water (from a tap or refrigerator)
- * 1/8/15: test tubes
- 1/5/15: deep glasses or tall jars
- 1/5/15: tubs or trays to catch water overflow
- 1/7/17: condiment packets (fast-food type) that float in water
- * 1/15/15: pinches modeling clay (oil-based, waterproof)
- 1/15/15: staples
- * 1/2/8: boxes of paper clips
Diving Into Pressure and Buoyancy - Printed Copy
26-page printed copy in a friction binder
We print instead of you, and pass along the shipping and handling charges.
Clay - modeling
Sold by the 100 gram stick, about 1/4 cup, in assorted colors (our choice). One stick serves a whole classroom for TOPS applications.
This little flat stick that held your childhood popsicle aloft has many constructive lab applications. Needed for #200 Diving into Pressure and Buoyancy.
glass, with rubber bulbs and screw-on plastic bottle top
These have many lab uses. You may purchase them separately here, or with 1/2 ounce dropper bottles (as item #1121).
Separately, these also double as Cartesian Divers in #200 Diving into Pressure & Buoyancy. If you already have droppers, test them in advance to see if they make good 'divers': Remove plastic bottle top, if any. Dropper must float when empty, then sink with a one-squeeze-intake of water. Test that the seal between bulb and barrel is water tight: The empty dropper should float for a day or so in a glass of water, without taking on visible water.
size #1, steel, box of 100
Paper clips have 1001 uses in TOPS experiments, and science in general. Feel free to use paper clips you already have, but be aware that different brands come in different sizes and weights. In experiments where uniformity is important, don't mix brands.
Rubber Bands - assorted
10 grams each of thin, medium and thick
You get 30 grams of soft, strong, durable rubber bands: thin #16 (about 50), medium #32 (about 20), and heavy-duty #64 (about 10). These sizes are specifically selected to work in most TOPS experiments.
Straws - straight
Any length straw, between 0.20 and 0.25 inches in diameter is suitable. Grocery stores generally carry straws with flexible "elbows." You can use those if you cut off the bendable section before using.
Tape - clear
3/4 inch x 1000 inch roll
Your standard desk tape with matte write-on surface.
Test Tube - small reusable
9 mL capacity with 13 mm OD and 4 inch (100 mm) length
A tough Pyrex test tube made with rim and thicker glass. Has a white spot for labeling.
Test Tube - medium disposable
19 mL capacity, 16 mm OD, 5 inch (125 mm) length
A lighter weight rimless Pyrex test tube made with thinner glass.