Centrifugation is a technique used for the separation of particles from a solution according to their size, shape, density, the viscosity of the medium and rotor speed. The particles are suspended in a liquid medium and placed in a centrifuge tube. The tube is then placed in a rotor and ... Read More

Polyvinyl Chloride or PVC is a tough chemically resistant synthetic resin made up of polymerizing vinyl chloride.It is used for a wide variety of products including pipes, flooring, sheeting, hoses, cable coatings, medical devices, and plumbing and automotive parts. It is used to make material for upholstery, housewares, shower curtains, ... Read More

The core of the sun is very hot and there is a lot of pressure in it due to nuclear fusion which takes place where hydrogen is changed to helium. Nuclear fusion creates heat and photons (light). The sun's surface is about 6, 000 Kelvin, which is 10, 340 degrees ... Read More

Irrigation of Crop is important because:1. It helps to increase productivity even in low rainfall.2. It improves productivity as compared to the un-irrigated land.3. It facilitates growing more than one crop in most of the areas.4. It helps to bring most of the sterile land under cultivation.5. It dissolves more ... Read More

Fibres are thread-like structures that are long, thin and flexible. These may be spun into yarns and then made into fabrics. Fabric means a woven material, a textile or other material resembling woven cloth. Fabric is made up of yarns.Fabrics are made by the two main processes known as weaving and ... Read More

Physical change is the change of that matter where only appearance or molecular arrangement of matter changes without changing its composition.Examples: Boiling and freezing of water, melting of wax, mixing sand and grains, crumpling a paper bag, chopping a wood etc.Properties of physical change are as follows:• Most of the ... Read More

Given :The given expression is $\frac{6}{5} \times ....=1$.To do :We have to find a suitable number in the blank.Solution :Multiplicative inverse is nothing but the number which nullifies (cancels) the existing number and makes it equal to unity.Multiplicative inverse of a is $\frac{1}{a}$.$a \times \frac{1}{a} = 1$.Therefore, $\frac{6}{5} \times \frac{5}{6} =1$Therefore, ... Read More

Nature always try to create a balance in the system. Technically it is known as equilibrium. Thus nature tries to create thermal equilibrium between hot and cold bodies. Everything is ready to go from high to low because of the availability of the gradient. The atoms in the hot bodies have higher kinetic energy than those of the cold bodies. ... Read More

Heron’s Formula: In 60 A.D, a great mathematician named Heron replaced the value “h” in terms of a, b, & c so, that height is not required to calculate the area of the triangle.The formula given by Heron about the area of a triangle is also known as Heron’s ... Read More

Irreversible change is a change where materials cannot be changed back to its original form.eg: burning of paper, burning of wood, rusting of iron, cooking of food, ageing of animals and humans, the ripening of fruits.