General Question

RedDeerGuy1's avatar

How does salt preserve food?

Asked by RedDeerGuy1 (11506points) January 15th, 2018

Just wondering. What is the science behind it ?

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3 Answers

elbanditoroso's avatar

By drying it out – read

LostInParadise's avatar

Here is a way of looking at it. If you drop some salt in water, the salt will disperse so that it is spread evenly. When you place salt on food, there is a high concentration of salt outside the cells. The water moves through the cell membrane to even out the salt concentration. You can think of it as the water dispersing through the salt.

Plants use this trick to get water to move through their roots. There is a salt gradient in the root cells, with an increasing concentration towards the plant. The salt is trapped in the cells. Water from outside the roots tries to dilute the salt concentration by moving along the gradient. That is why most plants can’t grow in salty soil.

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