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Transcript from a live voice lesson. The learner knew the definition. That was the problem.
You
I know the definition of osmosis. Why does the cell swell?
Suppose
Let's stop at the word "moves." Which side has more dissolved particles?
You
The inside, I think? But I still don't see why that pulls water in.
Suppose
Fair — "pulls" is the part that's misleading. Nothing is pulling. Try this instead: water molecules bounce around at random on both sides. Which side has more room for them to bounce into?
You
…the side with fewer particles in the way?
Suppose
Right. So more water happens to wander in than wanders out. No pulling, just traffic. Now — your page says "hypotonic solution." Given that, which way does the water go—
You
Into the cell. It swells.
Suppose
That's it. And if I flipped it to hypertonic?
The explanation changed because the first one didn't work.
Why not just ask an assistant?
Osmosis is the net movement of water across a semipermeable membrane from a region of lower solute concentration to one of higher solute concentration. In a hypotonic environment, water enters the cell, increasing internal volume and causing the cell to swell. This continues until equilibrium is reached or the membrane's capacity is exceeded.
"Which side has more dissolved particles?"
How it works
Suppose works from your own material, so every explanation stays tied to what you're actually studying.
01
Lecture notes, a chapter, a paper — whatever you're working through.
02
Let Suppose guide you, or interrupt whenever you want to question or challenge an idea.
03
Ask for another explanation or test what you understood before moving on.
Your voice is never stored
Your materials stay yours
Delete anything, any time
A lasting method
One principle in a long tradition of teaching through attention, questions, and explanation.
Begin with the right question.
Roman marble bust, Capitoline Museums — photo by Marie-Lan Nguyen, via Wikimedia Commons — Public domain
Learning should belong to everyone.
Bronze bust, Maharashtra Sadan, New Delhi — photo by Ashish Bhatnagar, cropped, via Wikimedia Commons — CC BY-SA 3.0
Let curiosity lead.
Portrait photograph, Nationaal Archief 119-0489, via Wikimedia Commons — Public domain
If it is not understood, explain it another way.
The Big T, Caltech yearbook, 1959, via Wikimedia Commons — Public domain
Before you begin
Anything you're studying. Suppose works from your own material and adapts to what you already know. During the private beta, lessons start from a PDF — notes, a chapter, a paper. More ways to bring material are coming.
No. Your microphone audio is never stored. Your materials stay private to your account, and you can delete them at any time.
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