cell osmosis - rasin lab HELP!!

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Roten910
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cell osmosis - rasin lab HELP!!

Post by Roten910 » Thu Jan 11, 2007 11:10 pm

Hey everyone, it's me again. I am doing a raisin lab for biology, and I'm finding out some information. I had a question I was wondering about, and I can't seem to find the answer. I'm dieing to know why some of the raisin were floating after they soaked in pure water for 24 hours. My results showed 1 still sunk, and the other 4 floating. When I began the lab all 5 sunk. Why are the others floating 24 hours later?

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Post by Doc44 » Fri Jan 12, 2007 6:13 am

volumne.... weight ...density

Doc44

There's usually one in every crowd that a little more dense.

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MrMistery
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Post by MrMistery » Fri Jan 12, 2007 1:29 pm

it depends on the density of the raisin. something floates if it's Archemedes force is equal or larger than it's weight. if the raisin had more water in it, it's density is smaller and the weight smaller. but in time, even the denser ones take up water..
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sachin
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Post by sachin » Fri Jan 12, 2007 5:29 pm

What about Rasin quality.?

It may affect....
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MrMistery
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Post by MrMistery » Fri Jan 12, 2007 7:15 pm

quality? define it. As in taste or...?
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sachin
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Post by sachin » Sat Jan 13, 2007 6:19 am

In our college we have used Rasin....

But do to chemecal contamination it went poor ... at shown poor results too....
Senior Education Officer, BNHS, India. www.bnhs.org

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