Introduction: Light a Fire With Water

About: Dad, Maker, biker, trekker, I like sciences, technology, martial art and wild.

Hi everybody! In this instructables I will show you how to make fire with... water!

The principle is to use water as a refracting lens. It is not complicated, with a little training, we start a fire in 1 minute chrono!

To start a fire you need 3 elements: an oxidizer, a fuel and an activation energy.
The oxidizer will be the oxygen contained in the air, the fuel will be the tinder and our activation energy: the sunlight that we will concentrate in one point thanks to water.

Let's go!!!

Step 1: Components and Tools Needed


- Water

- A transparent plastic bag

- tinder (in this instructable I used sawdust and crushed coal)


no tools!

Step 2: Preparing Tinder

One of the most important things when one wants to ignite a fire is the tinder. That's 50% of the work.

For this instructable, I used sawdust and crushed coal.

- saw wood and recover the sawdust.

- crush coal.

- mixing

- put in a nest of dry grass, or in a bark for example.

Step 3: Preparing Water

We will now prepare our refracting lens made of water.

- put the water in the bag.

- Forming a carrot by twisting 3 of the corners of the bag.

- Tighten the bag to have an almost sphere holding it at point A and B.

Step 4: Light the Fire!

Now that everything is ready, we can light the fire.

- hold your sphere of water above your tinder and move it gently in order to obtain a concentration of light in 1 point as bright as possible, almost white.

- When smoke starts to appear do not stop! Continue until there is a lot of smoke.

- blow gently on your ember.

- Add wood more bigger and bigger

Now you know how to light a fire with water! congratulations!

Step 5: Bonus: All Steps and Demonstration in Video!

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Explore Science Contest 2017

Runner Up in the
Explore Science Contest 2017