Complete Master List for #09 Floating and Sinking:
Key: (1st/2nd/3rd) denote needed quantities: (1st) enough for 1 student doing all activities; (2nd) enough for 30 students working in self-paced pairs; (3rd) enough for 30 students working in pairs on the same lesson. Starred* items may be purchased below.
- * 1/10/10: small 10 mL graduated cylinders
- 1/1/1: source tap water, hot and cold
- * 1/10/10: gram balances. Use the equal-arm balance improvised in Weighing #05, or any lab balance.
- 1/1/1: box table salt
- 2/2/2: quart jars or equivalent with lids
- 1/1/1: bottle 70% isopropyl alcohol. Sold in home remedy section of pharmacies.
- 1/1/1: bottle 100% corn oil
- 1/1/1: bottle baby oil (mineral oil)
- * 5/45/50: large 6 ounce baby food jars with lids
- * 5/45/50: eyedroppers
- 1/1/1: roll paper towels
- * 1/2/4: rolls masking tape
- 1/5/10: jars or glasses, 8 ounces or more
- 1/10/10: test tubes (or small graduates)
- * 2/15/15: emergency candles
- * 1/1/1: box straight pins
- 1/2/5: needle-nose pliers with wire cutting edge
- * 1/10/10: large 100 mL graduated cylinders
- * 3/30/30: straight plastic drinking straws
- 1/2/5: paper punch tools
- 1/10/10: hand calculators
- * 0.5/5/5: cups oil-based modeling clay
- 1/10/10: scissors
- 1/10/10: plastic margarine tubs (bowls)
- * 1/10/10: six-inch lengths wood dowel
- 1/3/3: toothpicks
- * 1/1/1: packages birthday candles
- 1/10/10: paper drinking cups, 6 ounces or larger
- 1/5/10: medium-sized cans
- 1/2/10: golf balls
- 2/10/20: size-D batteries, dead or alive
- 1/4/10: centimeter rulers
- 1/1/1: box plastic wrap
- * 2/20/20: natural or synthetic corks (not rubber), wine-cork size or larger. Two smaller corks may also be used together, or larger corks may be trimmed down.
- 1/10/10: plastic sandwich bags
- 1/10/10: large cereal boxes
- * 2/15/20: large rubber bands
- * 1/1/1: roll 28 gauge steel wire
- 1/3/10: meter sticks
- * 1/10/10: paper clips
- * 1/1/1: spool of thread
- * 1/10/10: film canisters
- * 1/3/10: solid rubber stoppers
- 1/3/10: books of matches
- 1/3/10: plastic lids
- * 1/1/1: package BB shot
- 1/3/10: tablespoons
- * 1/1/1: blue food coloring with dispenser
- 1/10/10: ice cubes
- 1/2/10: helium-filled balloons
Baby Food Jars - assorted
Each set includes 4 small, 4 medium and 4 large glass jars.
Candles - birthday
Needed for #09 Floating and Sinking, #11 Oxidation, and #14 Kinetic Model.
Candles - emergency
cylindrical, 5 inches by about 3/4 inches diameter
Also called utility candles. A handy heating source. Correctly sized for #09 Floating and Sinking. Drip catchers not included.
16-mm film-canister, snap-on lid
Once ubiquitous, now hard to find. Needed for #09 Floating and Sinking, #16 Pressure, and #23 Rocks and Minerals.
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.
Dowel - thick
wood, 3/4 inch diameter x 6 inch length
Needed for #09 Floating and Sinking. Must float freely inside a graduated cylinder.
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.
Food Coloring - blue
liquid, dispensed in 1 fl. oz. squeeze bottle
A handy science supply used to make water more visible. Used in #39 Corn and Beans, #41 Planets and Stars, and several other TOPS modules.
Graduated Cylinder - 10 mL
shatter resistant plastic on stable base
An important lab inquiry tool for measuring small liquid volumes.
Graduated Cylinder - 100 mL
shatter resistant plastic on stable base
An important lab inquiry tool for measuring larger liquid volumes.
Gram Pocket Scale
digital, pocket size
Digitally weighs up to 500 grams, plus tare container. Sensitive to 0.1 gram in multiple weight units. Durable, but not childproof. Comes with two AAA batteries to get you started.
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.
Stopper - cork
This cork is about 1 inch in diameter across the larger end. You may freely substitute your own synthetic wine corks trimmed to size, or pair smaller corks together. Needed for #09 Floating and Sinking.
Stopper - rubber
black rubber, size #6, no hole
Used in #09 Floating and Sinking, #14 Kinetic Model, and #22 Machines.
steel, one and 1/16 inch long
Used in many TOPS experiments. Sometimes required for their magnetic properties. Don't purchase aluminum straight pins by mistake.
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 - masking
3/4 inch x 55 yd roll
A handy science supply used in most TOPS modules.
light duty, 25 yd spool
Just plain old thread. Used in many TOPS titles, especially in Pendulums #34.
Wire - 28 gauge iron
A specialty item used in #09 Floating and Sinking.