Why does salt draw liquid from sliced vegetables?

The short version is that water moves out of the cut vegetable tissue toward the salty surroundings. The name for water moving from an environment with more water and less salt toward one with less water and more salt is osmosis. The University of Minnesota Extension describes salt as moving water out of produce and notes that dry brining cut produce can remove water from inside cell walls. [S1]

Adding salt makes the surroundings salty. The liquid you see collecting is a visible sign of water leaving the produce. It is not salt somehow creating water. The source explains the mechanism in the context of pickling and dry brining; it does not establish exactly how much liquid a particular vegetable will release or how quickly.

Yes. Treat it as a simple observation, not a test with a guaranteed amount of liquid. Use a small portion of one kind of vegetable so you can easily see what changes.

1. Put a few slices in a small dish or on a plate with a slight edge.
2. Sprinkle a little salt over them, using a modest amount rather than trying to cover them heavily.
3. Leave the dish where you can check it, and note what you see at the start and later.
4. Look for moisture on the slices or liquid gathered in the dish.

For a simple comparison, set aside a similar portion without salt in another dish. That gives you a side-by-side observation. Keep the portions and observation conditions as similar as you reasonably can; this is an informal demonstration, not a controlled experiment. The source supports the general salt-and-water movement, but does not specify a demonstration recipe, exact waiting time, or expected volume. [S1]

Record what you actually observe rather than deciding in advance what the result should be. For example, note the vegetable, whether the slices were salted, what the slices and dish looked like at the start, and what you saw when you checked again. You can write “a few visible drops,” “moist surface,” or “no visible change” instead of guessing an amount.

If the salted portion looks wetter, that observation fits the explanation that salt can draw water out of produce through osmosis. [S1] If you do not see liquid, it does not by itself disprove the explanation: the source does not establish a minimum visible amount or a fixed time for liquid to collect. Avoid turning one small kitchen observation into a precise measurement or a claim that all vegetables behave identically.

You can copy and fill in this note:

“Vegetable: [name]. Salted portion: [brief description]. Comparison portion: [brief description, no salt]. At the start, I saw: [observation]. When I checked later, I saw: [observation for each portion]. My conclusion: [describe what I observed]. Salt can draw water out of produce through osmosis, but this small observation does not measure exactly how much water moved or prove that every vegetable will release the same visible amount.” [S1]

The important distinction is between the explanation and your observation: osmosis describes the water movement, while your note records what happened in these particular dishes. The cited source discusses pickling and dry brining; it does not provide a universal timing guide or predict the outcome of this specific kitchen demonstration.