My mum and dad are talking about this.

if you fill a plastick bottle absolutly full with water, would the plastic bottle float in water?

Just tried and

no

Buxton Spring Water minibottles do not float when completely full (EDIT ...with the lid off).

I thought it might.

I thought that certain plastics would and maybe others (such as polypropyline PP) would sink.

Is this with the bottle lid on or off?

securly on

No it shoudn't float for any plastic bottle full of water will have a greater specific gravity than water itself.
However there are ways of making something heavier than water float.
You can make a dressmaking pin float. First lay a piece of loo paper on the still surface of the water, and carefully place the pin on the paper . The paper should sink and the pin stay on the surface, held by surface tension. If you then drop a spot of detergent into the water the surface tension lowers and the pin will sink.

Oh dear, do your Mum and Dad not get out very much then?



Amber
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