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floating seeds in water

Floating seeds

Adding salt to water increases its density and allows some objects – like apple seeds – to float which would sink in pure water.

This is a faster and cheaper classroom alternative to the often cited experiments of making an egg float by adding salt to water or comparing the buoyancy of a can of Cola and Cola light.

Dissolving salt or sugar in water increases the density of the liquid.

Objects with lower density than their surrounding liquid (or gas) float, while objects with higher density sink.

Since salt dissolve faster in warm water, it saves you time to have warm water prepared in a thermos flask. To save salt, it is recommended to fill the cups only to a third with water.

Fill a cup to about a third with warm water and add two or three apple seeds.

1. Why do the seeds sink?

2. If you mix a tablespoon of salt in the water, what makes the seeds raise?

When do objects float on water?
› When they have a lower density than the water.

Do the seeds change their density?
› No.

What happens to the salt in water?
› It dissolves.

Does pure water and water mixed with salt have the same density?
› No.

The density of most seeds is only slightly higher than that of water. Dissolving salt or sugar in water increases the liquids density. When the liquid’s density surpasses the seeds’ density, the seeds start to float.

Adding salt to water increases its density and allows some objects – like apple seeds – to float which would sink in pure water. This is a faster and cheaper classroom alternative to the often cited experiments of making an egg float by adding salt to water or comparing the buoyancy of a can of Cola and Cola light.

seeds in a cup of water, supposed float or sink?

socom3riot
Well-Known Member
KWsmoke
Well-Known Member
RastaCourage
Well-Known Member

that’s how i germinate my seeds
someone posted a ‘how to germinate’ thread
& i told him how to do it exactly
but, you leave them in there for at least 24 hours
& if they don’t sink, take your finger & twirl the water around the seed
if it still hasn’t sunk then leave in there for another 12 hours

but, you need to keep them in a warm dark place
like place larger over your cup filled half way with the seed inside
like you can throw it in your growbox or whatever

they don’t need to pop/crack like others do it
once it has sunk it can sprout ones that don’t wont
like the ones that don’t sink after 12 hours..

after it has sunk take a pair of tweezers & plant it knot side up
& put a piece of saran wrap over the cup you plant it in
& turn the lights on for your schedule ( 18/6 24/0 ect )

then they will sprout in less than 3 days

Eharmony420
Well-Known Member
RastaCourage
Well-Known Member

EDIT: the knot side up is the stubby part of the seed
& the pointy side goes face down into the soil
you should plant it 1/3 of the soil down

it’s no bullshit because i do it that way lol

– my computer is acting up.. my reply got posted twice..

RastaCourage
Well-Known Member

the knot side up is the stubby part
& the pointy side goes face down

it’s no bullshit because i do it that way lol

Eharmony420
Well-Known Member
Bangers999
New Member
RastaCourage
Well-Known Member

haha it’s all good, it works really well
i’m just not into the whole paper towel method..
i just don’t like it for some reason..

are you currently growing? link me.. lol
i would like to see your grow, if that’s okay with you..

topfuel29
Well-Known Member

that’s how i germinate my seeds
someone posted a ‘how to germinate’ thread
& i told him how to do it exactly
but, you leave them in there for at least 24 hours
& if they don’t sink, take your finger & twirl the water around the seed
if it still hasn’t sunk then leave in there for another 12 hours

but, you need to keep them in a warm dark place
like place larger over your cup filled half way with the seed inside
like you can throw it in your growbox or whatever

they don’t need to pop/crack like others do it
once it has sunk it can sprout ones that don’t wont
like the ones that don’t sink after 12 hours..

after it has sunk take a pair of tweezers & plant it knot side up
& put a piece of saran wrap over the cup you plant it in
& turn the lights on for your schedule ( 18/6 24/0 ect )

ok so I germinated my last batch of seeds with the cup of water thing.. anyways, my last ones sunk… n these once wont sink lol… does it matter