Chimie : réaliser l’expérience du volcan
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Fires in slums are a recurring problem with very often devastating consequences. In South Africa, an average of 10 "shacks" fires per day have been recorded each year, causing thousands of families to lose their belongings and housing without any possibility of compensation.
The fires, often belatedly detected, spread at high speed in these dwellings made of flammable materials. Prevention maneuvers are of course preferred to the means of reaction, but the populations often lack tools at their disposal to react quickly in bicarbonate de soude liquide vaisselle vinaigre of problem.
Because fires are very common, this amount can become very important for a low-income family. This low-tech fire extinguisher is mainly made from recycled materials, and products to buy are common and available for less than one euro.
The design is inspired by the work of Kahn and Firfirey It has been tested and approved in the presence of city firefighters, and is effective against Type A fires common fuels such as wood or paper and B flammable liquids such as petroleum, paraffin or LPGtypes of the most recurrent fires in slums.
Its implementation on site was unfortunately not developed due to lack of time and resources, and the technology has not yet been taken up by other study groups or organizations, but the tutorial was transmitted by the team Nomade des Mers has different people bicarbonate de soude liquide vaisselle vinaigre have noted its usefulness.
Its location in slums requires substantial work but does not pose a major challenge, bicarbonate de soude liquide vaisselle vinaigre because it does not conflict with the habits of homes. People may be reluctant to systematically make this low-tech every time a fire is extinguished very scouring casemodels are to imagine and develop for the manufacture and spread easily. Materials A plastic bottle of 2L A fine plastic bag for fruits for example A big nail mm x 4 mm A BIC pencil spring A cork Paperclips or pieces bicarbonate de soude liquide vaisselle vinaigre metal drilling drops for example Masking tape for painting mL of alcohol vinegar mL of water g of baking soda One tablespoon of dishwashing liquid Tools A drill Two wicks 7 mm and 4 mm Cutting pliers A funnel Instead of the drill, you can use a heated knife or other tool that can drill a hole in a plastic bottle, as cleanly as possible.
The low-tech fire extinguisher is based on the reaction between baking soda and acetic acid vinegar. 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: Water, carbon dioxide and soda extinguish the fire, and the foam created by the washing-up liquid prevents it from being re-ignited.
The bottle will be filled to three quarters with liquid, so it is important to make the hole above this limit. When using the extinguisher, it is the pressure of the cork on the pieces of metal that will pierce the bag. Close the bottle with its cap, by wedging the plastic bag in the neck, so as to make a small bag of baking bicarbonate de soude liquide vaisselle vinaigre 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. Shake the bottle by plugging the hole with a finger to thoroughly mix the dishwashing liquid, water and vinegar.
Shake the bottle by plugging the hole with a finger to dissolve the bicarbonate in mixture and increase the pressure. Sweep the base of the fire with the foam. It is advisable to turn the bicarbonate de soude liquide vaisselle vinaigre over for bicarbonate de soude liquide vaisselle vinaigre aiming, and so that all the liquid is well ejected.
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To edit this page, create an account or log in. Page Discussion 0 History. Very easy Very easy. Description Make a fire extinguisher for type A and B fires. Make a fire extinguisher for type A and B fires. Materials A plastic bottle of 2L A fine plastic bag for fruits for example A big nail mm x 4 mm A Bicarbonate de soude liquide vaisselle vinaigre pencil spring A cork Paperclips or pieces of metal drilling drops for example Masking tape bicarbonate de soude liquide vaisselle vinaigre painting mL of alcohol vinegar mL of water g of baking soda One tablespoon of dishwashing liquid.
Step 1 - Operation The low-tech fire extinguisher is based on the reaction between baking soda and acetic acid vinegar. Step 2 - Preparation of the bottle Drill a 7 mm diameter hole in the top of the bottle and cover it with masking tape.
Step 4 - Baking soda 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 orderbeing careful not to pierce the bag. Step 5 - Preparation of the activator 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.
Step 6 - Final assembly 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. Remove excess plastic around the neck. The fire extinguisher is ready! Step 7 - Use 1. Remove the bicarbonate de soude liquide vaisselle vinaigre 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. Step 8 - Safety first! 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. You entered an invalid page name, with one or many of bicarbonate de soude liquide vaisselle vinaigre following characters: You doesn't have an account?
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