# The Particle Model of Matter Crossword

All matter, solid, liquid, or gas, is made of tiny particles that are always moving and have spaces between them ([Topic](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36471), [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36473), [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36475)). This puzzle reviews words tied to that idea: how particles arrange themselves in a solid, liquid, or gas ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36475)), how heating and cooling cause a phase change and make matter expand or contract ([Guiding question](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36576), [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36577), [Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36579)), how a thermometer uses that expansion to measure temperature ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36579)), and how density, buoyancy, viscosity, and compressing a gas or liquid connect back to the spacing of particles ([Details](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36475), [Topic](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/17299), [Outcome](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/17303)). Solve the clues below using what you know about how particles behave.

## How to play

- Read each clue. Its number matches a numbered square in the grid.
- Write one capital letter in each square. There are 6 words across and 2 words down.
- Crossing words share a letter, so check it fits both. The answer key shows the finished grid.

## Puzzle grid
| ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | 1 | ■ | ■ | ■ | ■ | ■ |
|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
| ■ | ■ | ■ | ■ | ■ | 2 | ■ | ■ | 3 |   |   |   |   |   |   |   | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | 4 |   |   |   |   |   |   | ■ | 5 |   |   |   |   |   |   |   |
| ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | 6 |   |   |   |   |   |   |   |   |   |   | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ |
| ■ | 7 |   |   |   |   |   |   |   |   | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ |   | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ |
| 8 |   |   |   |   |   |   |   | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ |

## Clues
### Across

3. A tiny piece of matter that makes up all substances. (8)
4. A comparison of how much matter is packed into a certain amount of space. (7)
5. The upward force that allows objects to float in a fluid. (8)
6. A tool that measures temperature using the expansion and contraction of a liquid. (11)
7. The increase in size or volume when matter is heated. (9)
8. To squeeze or reduce the volume of a gas or liquid under pressure. (8)

### Down

1. How thick or sticky a liquid is, affecting how easily it flows. (9)
2. A change from one state of matter to another, such as melting or freezing. (11)

## Answer key
- **1 down**: VISCOSITY
- **2 down**: PHASECHANGE
- **3 across**: PARTICLE
- **4 across**: DENSITY
- **5 across**: BUOYANCY
- **6 across**: THERMOMETER
- **7 across**: EXPANSION
- **8 across**: COMPRESS

| ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | V | ■ | ■ | ■ | ■ | ■ |
|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
| ■ | ■ | ■ | ■ | ■ | P | ■ | ■ | P | A | R | T | I | C | L | E | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ | H | ■ | ■ | ■ | ■ | ■ | ■ | S | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ | A | ■ | ■ | ■ | ■ | ■ | ■ | C | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | D | E | N | S | I | T | Y | ■ | B | U | O | Y | A | N | C | Y |
| ■ | ■ | ■ | ■ | ■ | E | ■ | ■ | ■ | ■ | ■ | ■ | S | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ | C | ■ | ■ | ■ | ■ | ■ | ■ | I | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | T | H | E | R | M | O | M | E | T | E | R | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ | A | ■ | ■ | ■ | ■ | ■ | ■ | Y | ■ | ■ | ■ | ■ | ■ |
| ■ | E | X | P | A | N | S | I | O | N | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ |
| ■ | ■ | ■ | ■ | ■ | G | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ |
| C | O | M | P | R | E | S | S | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ | ■ |

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*AILI game · language en · model claude-sonnet-5 · generated 2026-09-17 · id 0f021c62-970e-4001-9bca-a67f15d2ae3f*

### Sources

- node:n1: Matter: Understandings of the physical world are deepened by investigating matter and energy. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36471)
- node:n2: How can states of matter and other physical properties be explained using the particle model of matter? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36472)
- node:n3: Students investigate the particle model of matter in relation to the physical properties of solids, liquids, and gases. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36473)
- node:n4: Details (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36475)
- node:n5: Matter: Understandings of the physical world are deepened by investigating matter and energy. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36575)
- node:n6: How can the particles of matter be influenced by heating or cooling? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36576)
- node:n7: Students investigate how particles of matter behave when heated or cooled and analyze effects on solids, liquids, and ga (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36577)
- node:n8: Details (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/36579)
- node:n9: Unit A: Mix and Flow of Matter (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/17299)
- node:n10: Outcomes for Science, Technology and Society (STS) and Knowledge (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/17300)
- node:n11: *Students will:* Investigate and compare the properties of gases and liquids; and relate variations in their viscosity,  (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/17303)