### Other Chapters For 7th

• 7th-class Maths Chapter 28

Statistics is a branch of mathematics dealing with the collection, analysis, interpretation,...
• 7th-class Maths Chapter 28

Division is one of the four basic operations of arithmetic, the others being addition,...
• 7th-class Maths Chapter 27

n probability theory, an experiment or trial (see below) is any procedure that can be infinitely...
• 7th-class Maths Chapter 26

The only difference between cubes and cuboids is the shape of the six faces. Each face of...
• 7th-class Maths Chapter 25

In calculus, integration by substitution, also known as u-substitution, is a method for finding...
• 7th-class Maths Chapter 24

Proportionality may refer to: Proportionality (mathematics), the relationship between two...
• 7th-class Maths Chapter 23

Probability is the measure of the likelihood that an event will occur. See glossary of...
• 7th-class Maths Chapter 22

The 'perimeter' of a shape is the distance around it. In order to calculate the perimeter of a...
• 7th-class Maths Chapter 19

A fraction (from Latin fractus, "broken") represents a part of a whole or, more generally, any...
• 7th-class Maths Chapter 18

Mental calculation or mental maths is an old mathematical tool. It is doing maths without using...

# 7th Class Chapter No 21 - Density in Science for IGCSE

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: where ρ is the density, m is the mass, and V is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume,although this is scientifically inaccurate – this quantity is more specifically called specific weight. For a pure substance the density has the same numerical value as its mass concentration. Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging. Osmium and iridium are the densest known elements at standard conditions for temperature and pressure but certain chemical compounds may be denser
Posted in 7th on February 13 2019 at 03:29 PM

### IGCSE 7th CLASS Science OTHER CHAPTERS

• 7th-class Science Chapter 28

Energy is an important ingredient in all phases of society. We live in a very interdependent...
• 7th-class Science Chapter 27

Heat transfer is a discipline of thermal engineering that concerns the generation, use,...
• 7th-class Science Chapter 26

forms of energy: thermal (heat), light, electrical, sound, kinetic, chemical, nuclear and...
• 7th-class Science Chapter 25

Energy cannot be created or destroyed, only converted from one form to another. These...
• 7th-class Science Chapter 24

In everyday use and in kinematics, the speed of an object is the magnitude of its velocity (the...
• 7th-class Science Chapter 23

In physics, a moment is an expression involving the product of a distance and a physical...
• 7th-class Science Chapter 22

At terminal velocity the gravitational force down equals the air resistance force up. vehicle...
• 7th-class Science Chapter 20

Measurement is the assignment of a number to a characteristic of an object or event, which can...
• 7th-class Science Chapter 19

The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic...
• 7th-class Science Chapter 18

A metal is a material (an element, compound, or alloy) that is typically hard when in solid...