When working with flammable materials, it is advisable to have a fire extinguisher and one of the standards for laboratories and workshops is to have a device that manages to control the flames in the event of a fire. In this article, we will look at how to make a simple fire extinguisher with a simple formula based on a basic chemical reaction.
- A soda straw or a small plastic tube.
- Sodium bicarbonate.
- A cork or plasticine.
- A paper napkin
- A plastic bottle.
Assembly of our fire extinguisher
We start the assembly of our fire extinguisher, making a small device that will be the activator of our fire extinguisher. We take about 4 tablespoons of bicarbonate and place them on a napkin, then we make a small bag with the napkin to prevent the bicarbonate from spilling, using a bit of thread to fix the bag made with the napkin.
Now, wash the plastic bottle with dishwasher and let it dry. Once dry, add about 5 tablespoons of vinegar inside the bottle and with the help of the string, fix the bag (which we have made with the napkin) inside the bottle, making sure that it does not touch the vinegar.
We proceed to make a kind of pressure cap with a cork or with the original cap of the bottle, we make a hole in the middle of the cap or the cork and we put the straw through it. We seal it using the plasticine to avoid air leaks through the lid.
Next, we place the lid on the bottle and with the help of the plasticine we finish sealing the edges to avoid leaks. Now, we cover the free end of the straw with a finger, shake the bottle vigorously and we will see that a violent effervescence occurs inside the bottle, we wait a few seconds and we release the end of the straw and we can see how it works. fire extinguisher.
How it works
Inside the bottle, one of the most basic chemical reactions occurs, an acid-base neutralisation. These reactions occur when an acid, such as acetic acid (vinegar), comes into contact with a basic salt such as sodium bicarbonate.
This reaction produces the release of gases such as carbon dioxide, which is widely used to extinguish fires, as it suppresses the amount of oxygen in a combustion and extinguishes the fire. simple homemade fire extinguisher.