The greatest advantage of SI is that it has only one unit for each quantity (type of measurement). This means that it is never necessary to convert from one unit to another (within the system) and there are no conversion factors for students to memorize.

International System of Units (SI), French Système International d’Unités, international decimal system of weights and measures derived from and extending the metric system of units. Adopted by the 11th General Conference on Weights and Measures (CGPM) in 1960, it is abbreviated SI in all languages.

The International System of Units (SI, abbreviated from the French Système international (d’unités)) is the modern form of the metric system….International System of Units.

SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit system.

SI units are interrelated in such a way that one unit is derived from other units without conversion factors. SI is used in most places around the world, so our use of it allows scientists from disparate regions to use a single standard in communicating scientific data without vocabulary confusion.

The SI unit of energy/work is the joule (J), named for English physicist James Prescott Joule (1818 – 1889). Joule discovered the relationship between heat and mechanical work, which led to the development of the laws of thermodynamics.

A native of France whose work covered a range of fields, Blaise Pascal contributed to many mathematic and scientific theories and laws. An inventor, he created one of the first mechanical calculators. Pascal’s calculator could only add and subtract, but in the mid-1600s, that was a feat.

The seven SI base units, which are comprised of:

• Length – meter (m)
• Time – second (s)
• Amount of substance – mole (mole)
• Electric current – ampere (A)
• Temperature – kelvin (K)
• Luminous intensity – candela (cd)
• Mass – kilogram (kg)

The SI (mks) Unit System A unit system that adopts meter (m), kilogram (kg), second (s) as their standard is called the mks unit system. As a metric unit system concluded in 1875, there were several problems.

From Wikipedia, the free encyclopedia. The MKS system of units is a physical system of measurement that uses the meter, kilogram, and second (MKS) as base units. It forms the base of the International System of Units.

In the case of work (and also energy), the standard metric unit is the Joule (abbreviated J). One Joule is equivalent to one Newton of force causing a displacement of one meter. In other words, The Joule is the unit of work.

The SI system, for this reason, is also called the MKS system. CGS system: On the other side or the second self-consistent system uses centimetres, grams and seconds for length, mass and time….Where are these systems used?

To convert a cgs formula to SI, multiply the symbols by a corresponding factor in Table 1. The derivative quantities are obvious. E.g., volume is r3, therefore is multiplied by 106. The charge density is Q/r3 and is multiplied by 10c/106 = 10−5c, etc.

You can also express the SI unit of speed in terms of the CGS system, or centimeter-gram-second system. In that case, cm/s or cm s-1 signifies the speed of a moving object.

The SI unit of dynamic viscosity is the newton-second per square meter (N·s/m2), also frequently expressed in the equivalent forms pascal-second (Pa·s) and kilogram per meter per second (kg·m−1·s−1).

kg-sec/meter.

Notes: The SI unit of viscosity is poiseiulle (Pl). Its other units are N s m-2 or Pa s.

A centipoise is one hundredth of a poise, or one millipascal-second (mPa⋅s) in SI units (1 cP = 10−3 Pa⋅s = 1 mPa⋅s). The CGS symbol for the centipoise is cP….Poise (unit)

Viscosity is a measure of a fluid’s resistance to flow. It describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.

For instance, honey has a much higher viscosity than water. Viscosity is measured using a viscometer. Measured values span several orders of magnitude. Of all fluids, gases have the lowest viscosities, and thick liquids have the highest.

Glycol has maximum viscosity because it has two −OH groups and there is greater intermolecular H−bonding in comparison to water and methanol. Kerosene is a mixture of hydrocarbons.

The unit of viscosity is newton-second per square metre, which is usually expressed as pascal-second in SI units.

With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. The gas viscosity will increase with temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.

Since the momentum transfer is caused by free motion of gas molecules between collisions, increasing thermal agitation of the molecules results in a larger viscosity. Hence, gaseous viscosity increases with temperature.