What is physical quantity
A physical quantity is a quantity that can be measured. It must consist of
1)numerical manitude
2) a unit
What is SI units
The International System of Units (SI) specifies a set of seven base units from which all other units of measurement are formed. These units are called SI derived units and are also considered part of the standard.
What are the 7 basic physical quantities/base quanitites
7 basic quanitities are measured in term of SI units. They are
1)Length (metre)
2)Mass (Kg)
3)Time (s)
4)Electric current (A)
5)thermodynamic temperature (kelvin)
6)Luminous intensity (candela)
7)Amount of substance (mole)
Example: Amount of substance (Mole)
The name "mole" was coined in German (as Mol) by Wilhelm Ostwald in 1893,[2] although the related concept of equivalent mass had been in use at least a century earlier. The name is assumed to be derived from the word Molekül (molecule).
-The mole is defined as the amount of substance of a system that contains as many "elementary entities" (e.g. atoms, molecules, ions, electrons) as there are atoms in 12 g of carbon-12 (12C)
-A mole has 6.0221415×1023[6] atoms or molecules of the pure substance being measured. A mole will possess mass exactly equal to the substance's molecular/atomic weight in grams.
-Because of this, one can measure the number of moles in a pure substance by weighing it and comparing the result to its molecular/atomic weight.
What is deprived quantity
Deprived quantity are deprived from these seven quanitities. For example area= length x length , distance travelled= time x length
Sunday, November 15, 2009
What is physics
What is Physics?
Physics is the scientific study of matter and energy and how they interact with each other.This energy can take the form of motion, light, electricity, radiation, gravity . . . just about anything!
Study of physics can be divided into major topics such as General physics, thermal physics, light, waves and sound, electricity and magnetism.
How Physics Works
As an experimental science, physics utilizes the scientific method to formulate and test hypotheses that are based on observation of the natural world.
Results of these experiments are use to formulate scientific laws, usually expressed in the language of mathematics, which can then be used to predict other phenomena.
The Role of Physics in Science
Generally, physics can be seen as the most fundamental of the natural sciences.
Chemistry, for example, can be viewed as a complex application of physics, as it focuses on the interaction of energy and matter in chemical systems. We also know that biology is, at its heart, an application of chemical properties in living things, which means that it is also, ultimately, ruled by the physical laws.
Physics is the scientific study of matter and energy and how they interact with each other.This energy can take the form of motion, light, electricity, radiation, gravity . . . just about anything!
Study of physics can be divided into major topics such as General physics, thermal physics, light, waves and sound, electricity and magnetism.
How Physics Works
As an experimental science, physics utilizes the scientific method to formulate and test hypotheses that are based on observation of the natural world.
Results of these experiments are use to formulate scientific laws, usually expressed in the language of mathematics, which can then be used to predict other phenomena.
The Role of Physics in Science
Generally, physics can be seen as the most fundamental of the natural sciences.
Chemistry, for example, can be viewed as a complex application of physics, as it focuses on the interaction of energy and matter in chemical systems. We also know that biology is, at its heart, an application of chemical properties in living things, which means that it is also, ultimately, ruled by the physical laws.
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