Fire Extinguisher:Classes:A) Standard fuels such as wood, clothing, paper, soft furnishings, plastic, garbageB) Combustible liquids such as petrol, oil and petroleum and paints. It may also include combustible gases such as butane and propane. Does not include fires containing cooking oils and greases.C) Electrical fires/electrical equipment such as motors, transformers and appliances. If power or electricity is removed, a class C fire becomes a fire of one of the other classes D) Combustible metals such as alkali metals, alkaline earth metals, semiconductors. For example potassium, magnesium, aluminiumK) Cooking oils and fats such as animal and vegetable fatsWhy each so specific:Water and foam: extinguishes fire by subtracting the fire element from the fire triangle. The foam separates the oxygen element from fire and other elements. Water extinguishers are only used for Class A fires for wood, paper, upholstered furniture, fabrics and clothing. It should not be used on class B because it would spread the liquid and on class C because it could create a shock Carbon dioxide: extinguishes fires by taking the oxygen element away from the fire triangle and also removes heat with a release of cold. It could be used on classes B and C without fear of creating a shock or spilling flammable liquids. It doesn't work for Class A fires as most are incomplete combustion reactions, so they would add more oxygen and carbon making the fire bigger and spreading it. Dry Chemical: Extinguishes the fire by interfering with the chemical reaction of the fire triangle. Most used multipurpose works in class A, B; C. also works by creating a barricade between the oxygen element and the fuel element of class A fires. Mo...... middle of paper ......and fire extinguished. Gas laws: Avogadro's law : Equivalent volumes of gas at the same temperatures and pressure conditions will have an equivalent number of atoms (particles, molecules, ions, electrons, etc.). Charles' law: as the temperature increases the volume of the gas also increases (directly proportional) provided that the pressure and quantity of gas are constant. Boyle's law: as the pressure of the gas increases, the volume decreases. As the volume increases, the pressure of the gas decreases. The temperature is constant. Guy-Lussac law: As the temperature of the gas increases, the pressure of the gas also increases provided that the volume and quantity of gas are constant. Temperature and pressure are directly proportional. Combined gas law: the product of pressure and volume divided by the absolute temperature of the gas is constant as long as the quantity of gas is kept constant