# Melt & Freeze — A Particle Simulation

> Interactive particle simulation for understanding matter and phase transitions. (iPhone/iPad app by Hans-Christian Graf von Bothmer.)

- Source: https://appshunter.io/ios/app/melt-and-freeze/id6670792050 (this page in markdown: same URL + `.md`)
- Developer: [Hans-Christian Graf von Bothmer](https://appshunter.io/developer/1767584102)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 15.6 · 0 MB
- Languages: English, German
- Released: 2024-09-11
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/melt-and-freeze/id6670792050/reviews.md

## What is Melt & Freeze?

With this interactive app, children and learners can explore and understand the particle model of matter in a playful way. It simulates the movement and interactions of particles, helping to visualize the physical principles of phase transitions—from solid to liquid and, to some extent, gaseous states.

Main Features:

	•	Real-Time Solid-Liquid Transitions: Observe how particles behave at different temperatures as they transition from solid to liquid.
	•	Interactive Control: Increase or decrease the temperature of the simulation and watch how the speed and movement of particles change.
	•	Adjustable Particle Count: Modify the number of simulated particles and see how the behavior differs in small and large systems.
	•	Educational Tool: Ideal for illustrating topics like the particle model, phase transitions, and thermodynamic processes in the classroom.
	•	User-Friendly: Designed specifically to introduce young learners to physical concepts.

This app is completely free and contains no ads or in-app purchases. It’s perfect for classroom use or independent learning at home.

Bring the fascinating world of particles to life on your screen and discover the physics behind phase transitions!

(This app was developed in collaboration with ChatGPT-4 and is open source: https://github.com/bothmer/TeilchenSim)

## Key features

- Real-time solid-liquid transitions
- Interactive temperature control
- Adjustable particle count
- Illustrates particle model
- User-friendly for young learners

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/melt-and-freeze/id6670792050/reviews.md

### 2/5 — Langweilig

*2024-12-07, version 1.2*

Ist zwar ein gutes Konzept aber, da man Nur die Temperatur beeinflussen kann wird es schnell langweilig

### 5/5 — tolle app

*2024-09-12, version 1.1*

Ich finde diese App sehr toll, da es interessant ist das schmelzen und gefrieren als teilchenmodell zu sehen und es auch selber steuern kann.
Außerdem lernt man auch etwas

## Frequently asked questions about Melt & Freeze

### What is Melt & Freeze?

Melt & Freeze is an interactive simulation app designed to help children and learners visualize and understand the particle model of matter and phase transitions, such as from solid to liquid.

### How does Melt & Freeze teach about particles?

It simulates the movement and interactions of particles in real-time, allowing users to observe how temperature affects their behavior and transitions between states.

### Can I change the simulation settings in Melt & Freeze?

Yes, you can interactively control the temperature to see particle speed changes and adjust the particle count to observe differences in small and large systems.

### Is Melt & Freeze suitable for classroom use?

Absolutely. It's designed as an educational tool to illustrate concepts like the particle model, phase transitions, and thermodynamic processes, making it ideal for classroom or home learning.

### What devices does Melt & Freeze support?

Melt & Freeze is available for iPhone, iPad, and iPod devices.

### What is the age rating for Melt & Freeze?

Melt & Freeze has an age rating of 4+, making it accessible for young learners.

### Does Melt & Freeze have ads?

No, Melt & Freeze is completely free and contains no advertisements.

### Are there any in-app purchases in Melt & Freeze?

No, Melt & Freeze does not feature any in-app purchases, offering a complete and uninterrupted learning experience.

## Version history (last 3 releases)

### 1.2 — 2024-09-20

- More particles are displayed at the beginning 
- Localization for German and English
- Runs on older iPhones starting from iOS 15.6
- The app is now open source: https://github.com/bothmer/TeilchenSim

### 1.1 — 2024-09-12

Bugfix:
- bei hohen Temperaturen wurde manchmal nach internem Fehler ein schwarzer Bildschirm angezeigt.

### 1.0 — 2024-09-11

No release notes.

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## Related topics

[particle sim](https://appshunter.io/ios/topics/particle-sim)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*