# Learn with DiveLogic

> A free, illustrated course in dive physics, decompression theory and dive planning, for divers and instructors. Every chart is planned with DiveLogic.

A free course by DiveLogic, written for divers and instructors with no technical diving experience. Each chapter explains one topic in plain English with illustrated, interactive charts planned with the DiveLogic dive planner.

## Part I: Gas and pressure

- [Chapter 1: Boyle’s law: pressure and volume](https://learn.divelogic.ai/guides/boyle): Robert Boyle’s air pump experiments, and why gas spaces shrink as you descend.
- [Chapter 2: Dalton’s law: partial pressure](https://learn.divelogic.ai/guides/dalton): John Dalton’s law of partial pressures, the basis of every gas limit in diving.
- [Chapter 3: Henry’s law: gas in liquid](https://learn.divelogic.ai/guides/henry): William Henry’s law of dissolved gas, and why the body takes up gas at depth.
- [Chapter 4: Air, nitrox, trimix and heliox](https://learn.divelogic.ai/guides/breathing-gases): What each breathing gas is for, and how partial pressure sets its depth limits.

## Part II: The body

- [Chapter 5: Decompression sickness](https://learn.divelogic.ai/guides/dcs): What causes decompression sickness, how it shows up, and what raises the risk.
- [Chapter 6: CNS oxygen toxicity](https://learn.divelogic.ai/guides/cns-oxygen-toxicity): Oxygen’s effect on the brain at high partial pressure, and how the CNS clock tracks it.
- [Chapter 7: Pulmonary oxygen toxicity](https://learn.divelogic.ai/guides/pulmonary-oxygen-toxicity): Oxygen’s slower effect on the lungs over long exposures, and how OTUs track it.
- [Chapter 8: Narcosis, helium and gas density](https://learn.divelogic.ai/guides/narcosis-and-density): How narcosis and gas density limit depth, and how helium helps.

## Part III: Decompression models

- [Chapter 9: How decompression models prevent DCS](https://learn.divelogic.ai/guides/decompression-models): What a decompression model does, the ideas every model shares, and why no model is a guarantee.
- [Chapter 10: Tissues and half-times](https://learn.divelogic.ai/guides/tissues-and-half-times): How tissues take up and release inert gas over time.
- [Chapter 11: Haldane and staged decompression](https://learn.divelogic.ai/guides/haldane): The 1908 goat experiments and the 2:1 rule behind staged decompression.
- [Chapter 12: Workman and the M-value](https://learn.divelogic.ai/guides/workman): Workman’s M-values: a separate limit for each tissue at each depth.
- [Chapter 13: Bühlmann ZHL-16](https://learn.divelogic.ai/guides/buhlmann): The 16-compartment model used in most dive computers today.
- [Chapter 14: Thalmann and the US Navy](https://learn.divelogic.ai/guides/thalmann): The US Navy’s linear-exponential model, where gas leaves more slowly than it enters.
- [Chapter 15: Bubble models](https://learn.divelogic.ai/guides/bubble-models): VPM and RGBM, deep stops, and what the 2011 US Navy trial found.
- [Chapter 16: Gradient factors](https://learn.divelogic.ai/guides/gradient-factors): How GF low and GF high set how close to the M-value you ascend.
- [Chapter 17: Isobaric counterdiffusion](https://learn.divelogic.ai/guides/counterdiffusion): How a gas switch at depth can cause bubbles without an ascent.

## Part IV: Equipment

- [Chapter 18: Early diving equipment](https://learn.divelogic.ai/guides/diving-equipment): Diving bells, surface-supplied helmets and the first self-contained open-circuit sets.
- [Chapter 19: The rebreather](https://learn.divelogic.ai/guides/rebreathers): From Fleuss’s oxygen rebreather to the modern electronic closed-circuit rebreather.
- [Chapter 20: Open circuit and rebreathers compared](https://learn.divelogic.ai/guides/open-and-closed-circuit): How gas use, oxygen and decompression differ between open circuit, semi-closed and closed circuit.
- [Chapter 21: Dive tables](https://learn.divelogic.ai/guides/history-of-dive-planning): How navy and agency tables were built and read, and where they fall short.
- [Chapter 22: Dive computers](https://learn.divelogic.ai/guides/dive-computers): What a dive computer measures, what it calculates, and what its numbers mean.

## Part V: Planning and diving

- [Chapter 23: Planning a dive with DiveLogic](https://learn.divelogic.ai/guides/planning-with-divelogic): How DiveLogic plans a dive: the model, the gas checks, oxygen, gas supply and contingencies.
- [Chapter 24: Turn pressure and waypoints](https://learn.divelogic.ai/guides/turn-pressure-and-waypoints): How to plan gas for a dive, when to turn, and how much gas you need at each point.
- [Chapter 25: Following a decompression plan](https://learn.divelogic.ai/guides/following-the-plan): What stops are, why you leave the bottom on time, and why you stay at or below each stop.

## DiveLogic

- [DiveLogic dive planner](https://app.divelogic.ai): decompression, gas and CCR dive planning
- [DiveLogic Handbook](https://docs.divelogic.ai): how the planner works
- [DiveLogic](https://divelogic.ai): the product site