How to Learn the States of Matter
Everything is a solid, liquid, gas or plasma, and matter changes between these states when you add or remove heat. Learning the states and the six named changes between them is foundational physics and chemistry. This deck covers both.
There are 12 cards in the deck below. You can read through them, practise them right here with the flip-card player, and then save the deck to study properly with spaced repetition — the method that makes them stick for months, not minutes.
Why the states of matter is hard to memorize (and the fix)
The state changes are easy to mix up — evaporation vs condensation, sublimation vs deposition. Pairing each change with its direction (gaining or losing energy) fixes them.
The fix is active recall plus spaced repetition. Instead of re-reading the list (which feels productive but barely works), you test yourself — pull each answer out of memory — and you review each card on a schedule that stretches over time. Every time you successfully recall a fact, the memory gets stronger and the next review is pushed further out. That's how you go from "I saw it once" to "I just know it."
The fastest way to learn the states of matter
- Break it into small batches. Learn the four states first, then the six changes as three pairs of opposites (melt/freeze, evaporate/condense, sublime/deposit).
- Test, don't re-read. Look at the question, say the answer out loud before flipping the card. The little struggle to recall is what builds the memory — a smooth re-read does almost nothing.
- Review on a schedule. Spaced repetition shows you each card right before you'd forget it. Get one right and it comes back in a few days, then a week, then a month. Miss one and it comes back sooner.
- Keep sessions short and daily. Five to ten minutes a day beats a two-hour cram every time. Consistency is the whole game.
One fact per card. Sublimation skips the liquid stage (dry ice, solid → gas) — a favourite exam question.
The full deck: the States of Matter
Here's every card in the set. Practise them above, or save the deck and let spaced repetition schedule your reviews automatically.
| Question | Answer |
|---|---|
| What are the three common states of matter? | Solid, liquid, and gas |
| What is the fourth state of matter? | Plasma |
| What is melting? | Solid → liquid (gaining heat) |
| What is freezing? | Liquid → solid (losing heat) |
| What is evaporation / boiling? | Liquid → gas (gaining heat) |
| What is condensation? | Gas → liquid (losing heat) |
| What is sublimation? | Solid → gas directly, skipping liquid (e.g. dry ice) |
| What is deposition? | Gas → solid directly (e.g. frost forming) |
| In which state are particles packed tightly and vibrating in place? | Solid |
| In which state do particles move freely and fill any container? | Gas |
| Does a solid have a fixed shape and volume? | Yes — fixed shape and fixed volume |
| Does a liquid have a fixed shape? | No — fixed volume but takes the shape of its container |
Save this deck and actually remember it
Create a free account, keep this 12-card deck, and we'll schedule every review at the perfect moment. First deck free forever — no credit card.
Study this deck free →FAQ: learning the states of matter
How long does it take to learn the states of matter?
Most people can lock in the states of matter within one to three weeks of short daily sessions. With spaced repetition doing 10–12 cards a day, you'll recognise them within days and recall them reliably within a couple of weeks.
What's the best way to memorize the states of matter?
Active recall plus spaced repetition. Test yourself instead of re-reading, and review on a schedule that spaces the cards out over time. Flashcards are built for exactly this — which is why the deck above is the fastest path.
Is this deck free?
Yes. You can practise all 12 cards on this page for free with no account. Sign up (also free) to save the deck and let spaced repetition schedule your reviews so it sticks long-term.