Categories
General Biology

Characteristics of life

Science > Biology > General Biology > Introduction to Biology > Characteristics of life Biology is a branch of science which studies living beings that all plants and animals including humans. Biology examines the structure, function, growth, origin, evolution, and distribution of living things. It classifies and describes organisms, their functions, how species come into existence, and […]

Categories
Human Biology

Alimentary Canal: Brief Idea

Science > Biology > Digestion and absorption in Human > Alimentary Canal: Brief Idea The digestive system in humans consists of an alimentary canal and associated digestive glands. The human alimentary canal (aliment: nourish) is a continuous muscular digestive tube about 8 to 10 m long that runs through the body. It is open at two ends […]

Categories
Physics

Concept of Strain Energy

Science > Physics > Elasticity > Concept of Strain Energy In this article, we shall study, work done in stretching wire and the concept of strain energy. Work done in Stretching a Wire: Consider a wire of length ā€˜Lā€™ and area of cross-section ā€˜Aā€™ be fixed at one end and stretched by suspending a load […]

Categories
Physics

Change in Surface Energy

Science > Physics > Surface Tension >Change in Surface Energy In this article. we shall study numerical problems on the change in surface energy due to breaking of drop or coalescence of number of drops into a one drop. Example – 01: Two mercury drops one of radius 2 mm and the other of radius […]

Categories
Physics

Numerical Problems on Surface Tension

In this article, we shall study numerical problems to find surface tension of liquid. Science > Physics > Surface Tension > Numerical Problems on Surface Tension Example – 1: A needle 5 cm long can just rest on the surface of the water without wetting. What is its weight? Surface tension of water = 0.07 […]

Categories
Physics

Concept of Surface Energy

Science > Physics > Surface Tension > Concept of Surface Energy In this article, we shall study the concept of surface energy, relation between the surface energy and surface tension. A molecule on the surface of a liquid experiences a downward pull due to surface tension.  If a molecule deep inside the liquid is to […]

Categories
Physics

Surface Tension in Everyday Life

Science > Physics > Surface Tension > Surface Tension in Everyday Life In this article, we shall study different phenomena due to surface film formed on the liquid surface due to surface tension. Examples of Surface Tension (Due to formation of the surface film): When a glass rod is dipped in water and taken out […]

Categories
Physics

Surface Tension

Science > Physics > Surface Tension > Surface Tension In this article, we shall study the concept of the surface tension, its characteristics and the factors affecting it. Intermolecular Forces: Between any two molecules, there exists a force of attraction. This force is called the intermolecular force. These intermolecular forces of attraction are of two […]

Categories
Physics

Angle of Contact

Science > Physics > Surface Tension > Angle of Contact When water is taken in a glass vessel, the free surface of the water near the walls is curved concave upward. If mercury is taken in a glass vessel, the free surface of mercury near the walls is convex upwards. When the liquid is in […]

Categories
Physics

Laplace’s Law of Spherical Membrane

Science > Physics > Surface Tension > Laplace’s Law of Spherical Membrane In this article, we shall study Laplace’s Law about the excess of pressure inside a drop or a bubble of a liquid. Excess of Pressure Inside a Drop of a Liquid and Soap Bubble: Due to surface tension, free liquid drops and bubbles […]