1. find out the characteristics of different synthetic fibres used in daily life and categorise them according to their properties. (any 5)
2. find out from your mom or any elder at home that for how many days your family us one LPG cylinder. what practice may be adopted in cooking to reduce the consumption of LPG.
Answers
Answer:
Synthetic fibres are made from chemicals and can have superior properties to natural fibres such as cotton or silk. Synthetic textiles are made from either inorganic products or a mixture of organic ones and chemicals. Some can be strong and durable. Some might dry extra quickly and others might be absorbent or very easy to dye.
Explanation:
One example of a synthetic textile is acetate, which is made from the cellulose resulting from the deconstruction of wood pulp or cotton. Acetate is soft and silky and drapes well. It dyes well but does not absorb moisture easily which means it dries quickly. Acetate is resistant to mildew and shrinkage and is often used to make linings because it absorbs moisture from the body. Acetate is also used to make home furnishings such as drapes and bedspreads.Another synthetic textile is acrylic which is soft and luxurious and also drapes well. It is not a heavy fabric but it gives warmth. It was originally used to make outdoor goods but now is common in clothing and carpet although pure acrylic can result in pilling. It can be dyed to bright colours. Acrylic is made from a petrochemical called acrylontrile.
Latex fabric derives from the latex fibre which comes from the milky or colourless sap of certain plants. It can be mixed with other fibres to make materials such as spandex. It is resistant to light and heat and is waterproof. Examples of latex products include gloves, soles and mattress pads.
Nylon is a polymide which is made from petroleum. It was discovered by a chemist named Du Pont. It is durable and lightweight. Nylon is quick drying and cleans easily because dirt does not cling. It can be static and does not absorb moisture so, if used it clothing, it can be clammy in the heat. Examples of nylon products include luggage, carpeting materials and hosiery because of its elastic recovery ability.
Polyester is soft and strong, resistant to shrinkage and does not stretch. It is a polymer which is produced from coal, water, air and petroleum products. It can blend with natural fibres such as cotton or wool or with artificial ones, to increase the fabric more durable and easier to wash. It can be used in clothing, filling for upholstery, floor coverings and insulation.
Rayon is created by the regeneration of natural materials. It is made from wood pulp and its properties are similar to those of linen or cotton. There are various types of rayon including regular, high tenacity, high wet modulus and microfibers. High tenacity rayon is strong and used mainly in industry. Regular rayon is often used in clothing. High wet modulus has high wet strength and microfibers are fine and silky.
Another example of synthetic textiles is spandex which can stretch up to 600 times and bounce back. Because of its elasticity, spandex is often used in apparel. It blends well with other fabrics, especially rayon, wool or silk. It is light and very comfortable to wear. Spandex is easy to dye and absorbs moisture and body oils. It is often used in hosiery and lingerie.
Answer:
1)Examples of a few synthetic fibers are polyester, acrylic, nylon, rayon, acetate, spandex, etc. Characteristics of synthetic fibers are: They have great resistance against wear and tear thus they are extremely durable. They do not get torn easily as they are very strong.
2)Use pressure cookers whenever possible. Since food is cooked under pressure inside a pressure cooker, it gets cooked fast (70% faster than conventional cooking techniques) and thus uses less fuel.
Also, you can put separators in the pressure cooker and cook 2 to 3 dishes at a time. In short, a pressure cooker saves energy and time.
Explanation: