Some of the priority problems facing the human race in which chemists is expected to make significant contributions towards solutions are listed below. The food-population problem In parts of the world where population is increasing much more rapidly than the food production famine-like(less availability of food as compared to what’s need) conditions exist. The Green […]
The term mole is derived from Latin language word which means a pile or mass of stones places in sea. Likewise word mole in chemistry means a pile of atoms, molecules, ions or electrons. Below are some of common definitions of mole which are used in Chemistry. Definition 1Mole is a concept of quantity in […]
Dimensions of any physical quantity means the way it is related to fundamental quantities like mass, length and time. These are usually denoted by [M], [L] and [T]. Square brackets are used around capital letter to indicate dimensions. For example – Dimensions of Area is [L2] because Area is defined as length multiplied by length. […]
The branch of science which deals with correct and precise description of the material universe is known as Physics. The word Physics comes from a Greek word meaning “knowledge of nature”. Physics attempts to describe fundamental nature of universe and how it works. For example – Physics explains why the sky is blue, why rainbows […]
This article is specifically for Class 11 students Physics is the physical science which deals with matter, energy and their transformations. Knowledge of physics will help you understand both natural phenomena and technologies that increasingly pervade out lives. There are numberers problems that physics fears. Yet we can describe and understand any problem with the […]
This article is for Class 11 students In doing rough calculations or comparisons, we sometimes round off a number to one or even no significant figures. A number rounded to nearest power of 10 is called order of magnitude. For example – If height of an object is 8 × 103 m, then we can […]
Today accurate measurement is an important part of physics. But no measurement is absolutely precise, there is always some uncertainty associated with every measurement. Uncertainty in a measurement is called Error When giving result of a measurement, it is a good practice to state estimated uncertainty or error. For example – if measured length of […]
The branch of Physics which deals with study of forces, motion and their relationship is called Mechanics. In mechanics, we try to understand and explain motion of material objects and also conditions under which objects remain at rest. By learning a few basic principles of mechanics, we can describe and explain motions of stars and […]
RestAn object is said to be in Rest if it does not change its position with respect to its surrounding with passage of time.For example – If a book is placed on top of a table and its not changing its position with passage of time, then we can say its at Rest. MotionAn object […]
The Matter is defined as something which occupies space, possesses mass and offers resistance to any stress applies on it. Matter have two types of properties – Physical and Chemical. Physical Properties means shape, hardness or softness, melting point, boiling point etc.Chemical Properties means ability of matter to change into new substance. Thus based upon […]