Osmosis
Osmosis is the spontaneous net movement of solvent molecules through a selectively permeable membrane from a region of high water potential to a region of low water potential, in the direction that tends to equalize the solute concentrations on the two sides.
At a glance
Key signals
0% cross fields · reaches 6 more
- Biology
- Cell Biology
- Biophysics
- Explanation
- Examples
- Misconception
- Sourced relations
- Attribution
Dependencies
What this concept builds on and what it makes possible — derived from the atlas’s dependency, causal and structural relations, not from every related edge.
System context
Osmosisis aDiffusionEstablished
osmosis is a kind of Diffusion.
Mechanism: Osmosis is diffusion of water: water crosses a membrane from where it is more concentrated to where it is less, balancing the two sides.
- Biology 2e (OpenStax) — demonstrates this case · verified · Osmosis is the diffusion of water across a selectively permeable membrane down its water-potential gradient. (Passive Transport)
Structural role & consequence
Interpreted from the current atlas graph — what the connections mean, not just how many there are.
Currently dark in the atlas: no key date stored · 1 of 2 of its relations lack claim-level evidence.
atlas representation · Describes the current Thinking OS representation, not the state of the world.
Structural neighbourhood: 2 → 8 → 33 concepts reachable within 3 hops.
structural · Structural reach — being reachable is not the same as being understood.
All 2 of its relationships stay within its own discipline — a field-specific concept in the current atlas.
structural · Structural graph analysis — not a claim of importance, causation or history.
cross-field
2 within-field, 0 cross-field
Strengths & constraints
Constraints
- No dated history stored — the atlas records no key date for this concept. atlas representation
Seen through each discipline
How this concept sits in each of its fields — derived from its real connections in the graph, not asserted.
Through this lens it connects to Diffusion and Lipid bilayer.
What it looks like
Concrete cases that make this idea recognisable in the real world.
Why salt wilts a slug (and lettuce)
Salt outside a cell makes the outside solute-rich. Water leaves the cell across its membrane to dilute the salt, and the cell shrinks — the same reason salted lettuce goes limp.
Check yourself
A quick check against a common misconception. Nothing is scored — picking the tempting-but-wrong answer just flags an idea worth revisiting.
Which statement is correct?
In osmosis, water moves toward where there is more water.
Water moves across a selective membrane toward the side with MORE dissolved solute (less free water), diluting it — down the water-potential gradient, not toward higher water concentration.
Related ideas to explore
Concepts that look related but are not yet connected here — candidates for a connection to reason about, not established links.
This idea also appears in…
The same structure shows up in other disciplines. These are real recurrences drawn from the graph — a starting point for asking “what carries over, and what changes?”
Diffusion & spread11 disciplines · 4 concepts
Concepts
shares a mental model
shares a mental model
shares a mental model
- Gas exchangePhysiology
shares a mental model
Mental models at work here
- Connects 2 other ideas across 3 disciplines.
- A cross-disciplinary bridge — its connections reach into 6 other fields.
- Most of its connections are of the “Kind & structure” kind.
- It exercises 1 reusable thinking pattern.
Derived from the graph’s real structure — observations, not a score.
Sources
- Wikipedia (English & German editions) verifiedmoderate evidence
- Wikidata verifiedmoderate evidence
- Biology 2e (OpenStax) (2018) verified