Units and Measurements

Physics

the natural science of matter, involving the study of matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force.

Classical Physics

Are the physics that were made before the 20th century. This part of physics studies movement, light, gravity, and electricity.

Under classical Physics

CALCULUS CLASSICAL MECHANICS FLUID MECHANICS THERMODYNAMICS WAVES

Calculus

Is a branch of mathematics concerned with calculating instantaneous rates of change (Differential calculus) and summating infinitely many small factors to determine some whole (Integral calculus).

Fluid Mechanics

Is the branch of physics concerned with the mechanics of fluids (liquids, gases, and plasmas) and the forces on them.

Thermodynamics

Is studying the relations between heat, work, temperature, and energy.

Waves

A wave is a disturbance in a medium that carries energy without a net movement of particles. It may take the form of elastic deformation, a variation of pressure, electric or magnetic intensity, electric potential, or temperature.

Modern Physics

Modern physics is a branch of physics that deals with the post-Newtonian concepts in physics. It is based on the two breakthroughs of the twentieth century

Post-Newtonian concepts

are a method for solving Einstein's field equations for physical systems in which motions are slow compared to the speed of light and where gravitational fields are weak.

Relativity

Einstein overthrew many assumptions underlying earlier physical theories, redefining in the process the fundamental concepts of space, time, matter, energy, and gravity.

Quantum Mechanics

Quantum mechanics is the field of physics that explains how extremely small objects simultaneously have the characteristics of both particles (tiny pieces of matter) and waves (a disturbance or variation that transfers energy). Physicists call this the “wave-particle duality.

Fundamental quantities

refers to a physical quantity that cannot be stated in any other physical quantity. Fundamental quantities are independent physical quantities that are not possible to be expressed in terms of any other physical quantity.

Derived quantities

quantities that are calculated from two or more measurements. Derived quantities cannot be measured directly. They can only be computed.

Metric Prefixes

Physical objects or phenomena may vary widely. For example, the size of objects varies from something very small (like an atom) to something very large (like a star)

Units

Units are used to measure a physical quantity, such as mass or length. In science, units are an established reference that allows you to define the magnitude of a quantity.