What are some things/materials that float in water?

Question

My daughter has to invent something and needs to know what will stay afloat in a pool.

Answer 1

Anything will float provided that it is sealed and hollow ,even concrete. I suspect that your little one needs to find something readily available at a hardware store.

In Styrofoam or polyurethane foam you can do about anything. using already blown sheets or blocks you can cut and glue to shape.  

If you want to mold  it you can buy  two pack polyurethane kit or buy it in a can and squirt or pour into the mold.

Answer 2

A dead cat will float to the top, after a few days.  However, as it decomposes, it will sink again.

Answer 3

Most wood floats

articles that are shaped like a ship(which displace an amount of water equal to their weight will float)

plastics float

objects filled with air float

bjects which have a density less than water will float

Answer 4

air, foam, surfboard, wood

Answer 5

You cant be serious. You really need help figuring out what floats in water?

Answer 6

Styrofoam

Answer 7

A plastic bottle with its lid on will not only float but can hold up a considerable weight on water

Answer 8

If you aren't sure if something will float in water, just throw it in a pool and see what happens.  That is much quicker than listing everything that could float.

Answer 9

very small rocks, churches, gravy....