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SI units

QUANTITIES AND UNITS

In physics there are two kinds of physical quantities, those are basic quantities and derived quantities. Basic quantities are the physical quantities the units of which predetermined, while the derived quantities are the physical quantities which the units of which are derived from basic quantity units.

 

1. Basic Quantities

EU allows pints and miles to stay on in metric world


EU flag 		but the acre is going

The European parliament on Tuesday 16 Dec 2008 saved the pint and mile from EU extinction, saving British and Irish drinkers from having to order half litres or drive at under 110 kilometres per hour.
Under the measure, agreed without a vote at a second reading in the Strasbourg chamber, traders will also be able to display imperial and metric measurements side by side in shops and elsewhere.

World population disputed


metric billion 		World population disputed...sort of

Canada and France argue that the world population is not approximately 6.6 billion.* In fact, they argue that the world population is 1,000 times smaller!** How can this be? As tempted as I am to let it stand with Canada and France being, well, Canada and France, I should explain the situation.

Metric Electrical Conduit Size


metricating eletrician 		Metric Electrical Conduit Size

The electrical conduit is a vital part of any wiring effort. To get it right, you need to understand metric electrical conduit size options. Electrical conduit refers to the tubing that contains electrical cable and wiring. Conduit serves a variety of purpose. It keeps the electrical cable contained and orderly. It protects the cables and provides fire protection where the cables pass through walls.

Kilogram Redefinition


Metric kilogram 		UK scientists working towards a redefinition of the kilogram

Scientists at the National Physical Laboratory (NPL) have released new research results that could affect how we measure a kilogram — the last SI unit based on a manufactured object. The International System of Units (SI) is the foundation for all our measurements from the beer in your pint to the gap between the tick and the tock on your clock.

SI units are defined by the General Conference on Weights and Measures. The next meeting of the conference, in November 2007, will consider a range of issues related to the maintenance of the SI, including an initial proposal to prepare for the redefinition of several of the base units.

Mole Day


metric mole 		What is Mole Day?

"Mole Day is an unofficial holiday celebrated among chemists in North America on October 23, between 6:02 AM and 6:02 PM, making the date 6:02 10/23 in the American style of writing dates. The time and date are derived from the Avogadro constant, which is approximately 6.022×1023, defining the number of particles (atoms or molecules) in a mole, one of the seven base SI units."

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