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- '''Check that the plastic bag is not punct … '''Check that the plastic bag is not punctured before doing this step''' * Cut the paper clip (or pieces of metal) into small pieces using the cutting pliers. They will help pierce the bag; * Slide the plastic bag through the neck of the bottle; * Pour the pieces of paperclip (or metal) and baking soda (in this order), being careful not to pierce the bag.der), being careful not to pierce the bag. +
- * Do not ingest the vinegar. In case of c … * Do not ingest the vinegar. In case of contact with eyes or hands, rinse with plenty of water. * Be careful using the drill or planting the nail in the cap. * Do not direct the jet of foam towards you or other people, aim the fire. * Be careful when activating the fire extinguisher. Hit the nail with the palm of your hand to avoid injury. * Attack the base of the fire, not the flames. * Metal is an excellent thermal conductor. It is advisable to thoroughly soak the metal parts that may have been affected by the fire, to avoid any recovery. ffected by the fire, to avoid any recovery. +
- * Drill a 4 mm hole in the cap of the pla … * Drill a 4 mm hole in the cap of the plastic bottle; * Place the spring on the nail and slip the nail into the hole of the cap, it is not supposed to be too much resistance; * Plant the nail in the cork. '''Note:''' When using the extinguisher, it is the pressure of the cork on the pieces of metal that will pierce the bag. e pieces of metal that will pierce the bag. +
- 1. Remove the tape; 2. Shake the bottle b … 1. Remove the tape; 2. Shake the bottle by plugging the hole with a finger to thoroughly mix the dishwashing liquid, water and vinegar; 3. Press the nail to pierce the bag. Repeat the operation until the bag is well drilled; 4. Shake the bottle by plugging the hole with a finger to dissolve the bicarbonate in mixture and increase the pressure; 5. Direct the jet towards the fire; 6. Sweep the base of the fire with the foam. '' 'Do not aim at the flames!' '' Aim the base of the fire to extinguish it. 7. It is advisable to turn the bottle over for easier aiming, and so that all the liquid is well ejected.nd so that all the liquid is well ejected. +
- Close the bottle with its cap, by wedging … Close the bottle with its cap, by wedging the plastic bag in the neck, so as to make a small bag of baking soda suspended above the liquid. The pocket should not be too big (just the volume of baking soda) so that it can be pierced by pressing the nail. Remove excess plastic around the neck. The fire extinguisher is ready!the neck. The fire extinguisher is ready! +
- Drill a 7 mm diameter hole in the top of the bottle and cover it with masking tape. '''Note:''' The bottle will be filled to three quarters with liquid, so it is important to make the hole above this limit. +
- Pour 750 mL of water, 750 mL of vinegar, and tablespoon of dishwashing liquid into the bottle. '''Note:''' for convenience, you can mix dishwashing liquid and water before pouring into the bottle. +
- The low-tech fire extinguisher is based on … The low-tech fire extinguisher is based on the reaction between baking soda and acetic acid vinegar. Water absorbs heat by evaporating; baking soda decomposes during an endothermic reaction (which absorbs heat) and creates water when exposed to a temperature exceeding 270 ° C; carbon dioxide is a heavy gas that "displaces" oxygen and "starves" the fire. A hole is drilled in the bottle. When you want to activate the fire extinguisher, pierce the bag containing baking soda. Vinegar, mixed with water, reacts with baking soda to form carbon dioxide, water and sodium acetate. By shaking the bottle, the reaction is accelerated: the carbon dioxide produced pressurizes the bottle, and a CO2-water mixture is ejected through the hole, which is pointed towards the fire. Water, carbon dioxide and soda extinguish the fire, and the foam created by the washing-up liquid prevents it from being re-ignited. liquid prevents it from being re-ignited. +
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