# data[].attributes.attachment_link.provider_name
Compare the Difference Between Similar Terms

# data[].attributes.attachment_link.readable_text
Fundamental vs Derived Quantities

Experimentation is a core aspect of physics and other physical sciences. Theories and other hypothesis are verified and established as scientific truth by means of experiments conducted. Measurements are an integral part of experiments, where the magnitudes of and the relations amongst different physical quantities are used to verify the truth of the theory or hypothesis tested.

There are very common set of physical quantities that are often measured in physics. These quantities are considered as fundamental quantities by convention. Using the measurements for these quantities and the relations amongst them, other physical quantities can be derived. These quantities are known as derived physical quantities.
Fundamental Quantities
A set of fundamental units are defined in every units system, and the corresponding physical quantities are called the fundamental quantities. Fundamental units are independently defined, and often the quantities are directly measurable in a physical system.

In general, a system of units requires three mechanical units (mass, length, and time). One electrical unit is also required. Even though above set of units may suffice, for convenience few other physical units are considered fundamental. c.g.s (centimeter-gram-second), m.k.s (meter-kilogram second), and f.p.s (feet-pound-second) are formerly used systems with fundamental units.

SI unit system has replaced much of the older units systems. In the SI system of units, by definition, following seven physical quantities are considered as fundamental physical quantities and their units as fundamental physical units.
Derived Quantities
Derived quantities are formed by product of powers of fundamental units. In other words, these quantities can be derived using fundamental units. These units are not defined independently; they depend on the definition of other units. Quantities attached to derived units are called derived quantities.

For example, consider the vector quantity of speed. By measuring the distance traveled by an object and the time taken, the average speed of the object can be determined. Therefore, speed is a derived quantity. Electric charge is also a derived quantity where it is given by the product of current flow and time taken. Each derived quantity has derived units. Derived quantities can be formed.
What is the difference between Fundamental and Derived Quantities?
* Fundamental quantities are the base quantities of a unit system, and they are defined independent of the other quantities.

* Derived quantities are based on fundamental quantities, and they can be given in terms of fundamental quantities.

* In SI units, derived units are often given names of people such as Newton and Joule.

# data[].attributes.attachment_link.title
Difference Between Fundamental and Derived Quantities | Compare the Difference Between Similar Terms

# data[].attributes.attachment_link.description
Fundamental vs Derived Quantities Experimentation is a core aspect of physics and other physical sciences. Theories and other hypothesis are verified and established as scientific truth by means of experiments conducted. Measurements are an integral part of experiments, where the magnitudes of and the relations amongst different physical quantities are used to verify the truth of the theory or hypothesis tested.

# data[].attributes.attachment_link.readable_text
The 7 traditional SI Basic Units can be derived from just these 3.

Time represents the idea of motion, and is defined as the fastest known motion -- according to the Speed of Light Definition of Time. Electrical field strength would be defined by the electrical charge of a rest mass electron. The defining physical object for length is still tough. Currently, length is defined using the atomic second, which may seem, to some scientists, a done deal. So why change it? Well, using the atomic second -- a sublight definition of time -- requires retaining Einstein's Relativity. To avoid this, an actual physical object's length is again required as in the good old days of physics. Perhaps the wavelength of a rest mass electron could be used. Whatever choice is used, it will be the weakest link in these units. It will be the toughest of the 3 Basic Units to define and will have the greatest error. Electric Charge can be used to derive mass -- using the unifying equation in the Ball of Light Particle Model therefore the Basic Unit of mass can be dropped. Mass would become a Derived Unit. Current can be derived from a moving charge, therefore it would also become a Derived Unit. Temperature can be derived as a statistical average of moving particles of mass, therefore it would also become a Derived Unit. The mole is just a number -- it is not a physical property of matter, or energy. Electric charge, length, and motion can be used to describe the photon. Using the description of the photon and length, luminous intensity can be described, therefore it would also become a Derived Unit.

A new Constant?

The exact equations for deriving SI Basic Units from these 3 Basic Units are not yet worked out. The scientific community -- as a group -- should debate what the exact derivations should be, due to the potential range of the constants that could be chosen. For example, in some systems of physics, scientists define the speed of light to be 1 (unity). While in SI Basic Units the speed of light is given the magnitude: 299,792,458. Which choice is made makes a tremendous difference. As another example, current physics gives the electrical charge a value of plus or minus one. However, some scientists have suggested it would be more convenient to work with charges expressed in thirds (1/3) of the charge now used. While making the transition to a new set of Basic Units, it might make sense to also improve the values of some constants, such as these. Are we now at the crossroads in history where a final set of Basic Units can be chosen for all time? Maybe...

# data[].attributes.attachment_link.keywords[]
the solution to the question what is time?

# data[].attributes.attachment_link.description
Basics Units are fundamental to physics. A new system is proposed. Time is redefined to be what is now called the speed of light. This site answers, the question, What is time? and provides the first Grand Unification Theory for physics intergrates gravity.

# data[].attributes.attachment_link.title
Conversion of Units and Question- 2&3, Exercise-2.5, Class 7 Maths- NCERT

# data[].attributes.attachment_link.readable_text
These are quantities obtained by combination of two or more fundamental quantities and they can be expressed as a product e.g.

Momentum is a product of Mass of a body and its velocity

(i) Momentum = Mass x Velocity

or as a quotient e.g.

(ii) Velocity = \( \frac {Distance}{Time}\)

Derived units are units obtained from combination of two or more fundamental units. They can be expressed as a product or quotient.

# data[].attributes.attachment_link.description
These are quantities obtained by combination of two or more fundamental quantities and they can be expressed as a product e.g. Momentum is a product of Mass of a body and its velocity (i) Momentum = Mass x Velocity or as a quotient e.g.