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Transcript of osmosis
How are you going to do it?
What is osmosis?Definition
The difference in the concentration of solutes inside and outside a cell controls how much water enters or leaves through its membrane.
This movement of water through membranes is called osmosis. It is fundamental for the survival of all cells.
Select the variables.
What are you going to measure?
dependent hot water
independent length of the fruits.
Select the equipment-materials.
What are you going to use?
1. Glass bowl
3. Raisins and a dried fig
4. Hot water
by: Virginia Humero and Silvia Moratinos.
If we moisten the surface of a raisin, then the water will go through the skin, the fruit will expand and after several days, in some cases, the skin will crack, because of the osmosis process.
First, we are going to measure the length of both dried fruits, then we are going to put them in a glass bowl with hot water. When the water cools we take out the fruits and measure them again. We can notice that the fruit has grown.
At the beginning the experiment:
the dried pig measured: 3cm
the raisin measured: 0,8 cm
After the experiment:
the dried pig measured: 3,3 cm
the raisin measured: 0,9 cm
As we thought the volume of the both dried fruit has increased due to water flow through the skin. But cracking has not been produced due to a previous lost of water by the transform of dried fruit.