Metric system - Revision history

Designing Buildings at 08:28, 4 January 2022

2022-01-04T08:28:26Z

← Older revision		Revision as of 08:28, 4 January 2022
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	Traditionally, metric conversion charts and tables would have been used to convert between different units in the metric system. For example, a table for length and area measurements may show the formulae for how to convert from square kilometres to square metres, or from square metres to square millimetres. Similarly, conversion tables or formulae might be used to convert from imperial units to metric units. More recently, the advent of the internet has ushered in a host of on-line calculators that allow instant and highly accurate conversions once the value to be converted is inputted.		Traditionally, metric conversion charts and tables would have been used to convert between different units in the metric system. For example, a table for length and area measurements may show the formulae for how to convert from square kilometres to square metres, or from square metres to square millimetres. Similarly, conversion tables or formulae might be used to convert from imperial units to metric units. More recently, the advent of the internet has ushered in a host of on-line calculators that allow instant and highly accurate conversions once the value to be converted is inputted.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Area.		* Area.
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	* Measurement.		* Measurement.
	* Notation and units on drawings and documents.		* Notation and units on drawings and documents.
		+	* Size.
	* Space.		* Space.
	* Units.		* Units.

Designing Buildings at 08:58, 7 December 2020

2020-12-07T08:58:18Z

← Older revision		Revision as of 08:58, 7 December 2020
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	* Watt.		* Watt.

−	[[Category:~~Education~~]] [[Category:~~DCN_Education_and_Training~~]] [[Category:Theory]] [[Category:Design]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Standard]] [[Category:Education]] [[Category:Theory]] [[Category:Design]]

Designing Buildings at 12:03, 4 March 2019

2019-03-04T12:03:27Z

← Older revision		Revision as of 12:03, 4 March 2019
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	= Introduction =		= Introduction =

−	The metric system is a decimalised measurement system ~~that is~~ used widely throughout the world for weights and measures in everyday life, trade, science and industry. It is used to ~~measure things such as~~ the weight of vegetables, the speed of a train, the height of a child, the intensity of light ~~and~~ the volume of water ~~in a tank~~.	+	The metric system is a decimalised measurement system used widely throughout the world for weights and measures in everyday life, trade, science and industry. It can be used for example to express the weight of vegetables, the speed of a train, the height of a child, the intensity of light, the volume of water and so on.

	One of the benefits of the metric system is its relative ease of understanding and application. Being a decimalised system, it is based on the power of 10 and parts of ten. So, there are 10 millimetres (mm) in a centimetre (cm); 100 centimetres in a metre (m) and 1,000 metres in a kilometre (km).		One of the benefits of the metric system is its relative ease of understanding and application. Being a decimalised system, it is based on the power of 10 and parts of ten. So, there are 10 millimetres (mm) in a centimetre (cm); 100 centimetres in a metre (m) and 1,000 metres in a kilometre (km).

−	This can be contrasted with the relative complexity of the Imperial system which was ~~not decimalised but~~ based on irregular bases, eg 12 pence in a shilling, 20 shillings in a pound (240 pence); 12 inches in a foot (ft), three feet in a yard (yd) and 1,760 yards (yds) in a mile.	+	This can be contrasted with the relative complexity of the Imperial system which was based on irregular bases, eg 12 pence in a shilling, 20 shillings in a pound (240 pence); 12 inches in a foot (ft), three feet in a yard (yd) and 1,760 yards (yds) in a mile.

	The imperial system also involved fractions that were more problematic when adding up, eg 1ft 3 3/4in plus 4ft 3 5/8in equals 5ft 7 3/8in. The metric equivalent of this addition is 396mm + 1310mm = 1706mm or 1.706m.		The imperial system also involved fractions that were more problematic when adding up, eg 1ft 3 3/4in plus 4ft 3 5/8in equals 5ft 7 3/8in. The metric equivalent of this addition is 396mm + 1310mm = 1706mm or 1.706m.
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	= International System of Units =		= International System of Units =

−	The term ‘metric system’ has been superseded by ‘International System of Units (SI)’ and the units that are used for measuring, such as kilograms and metres, are called SI Units.	+	The term ‘metric system’ has been superseded by the ‘International System of Units (SI)’ and the units that are used for measuring, such as kilograms and metres, are called SI Units.

	There are seven SI base units that form the foundation of the metric system:		There are seven SI base units that form the foundation of the metric system:
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	{\|		{\|
−	~~\|width="33%"~~\| Entity	+	\| Entity
−	~~\|width="33%"~~\| SI derived unit	+	\| SI derived unit
−	~~\|width="33%"~~\| Symbol	+	\| Symbol
	\|-		\|-
	\| Area		\| Area
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	Some SI derived units have been given special names and symbols such as watt (W) to represent power and radiant flux; joule (J) to represent energy, work and quantity of heat, and newton (N) to represent force.		Some SI derived units have been given special names and symbols such as watt (W) to represent power and radiant flux; joule (J) to represent energy, work and quantity of heat, and newton (N) to represent force.

−	Traditionally, metric conversion charts and tables would ~~often~~ have been used to convert between different units in the metric system. For example, a table for length and area measurements may show the formulae for how to convert from square kilometres to square metres, or from square metres to square millimetres. Similarly, conversion tables or formulae might be used to convert from imperial units to metric units. More recently, the advent of the internet has ushered in a host of on-line calculators that allow instant and highly accurate conversions once the value to be converted is inputted.	+	Traditionally, metric conversion charts and tables would have been used to convert between different units in the metric system. For example, a table for length and area measurements may show the formulae for how to convert from square kilometres to square metres, or from square metres to square millimetres. Similarly, conversion tables or formulae might be used to convert from imperial units to metric units. More recently, the advent of the internet has ushered in a host of on-line calculators that allow instant and highly accurate conversions once the value to be converted is inputted.

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =
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	* Watt.		* Watt.

−	[[Category:Education]] [[Category:Theory]] [[Category:Design]]	+	[[Category:Education]] [[Category:DCN_Education_and_Training]] [[Category:Theory]] [[Category:Design]]

79.76.6.11 at 00:36, 2 March 2019

2019-03-02T00:36:27Z

← Older revision		Revision as of 00:36, 2 March 2019
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	{\|		{\|
−	\| [[File:Metric.jpg]]	+	\| [[File:Metric.jpg\|link=File:Metric.jpg]]
	\|}		\|}

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	{\|		{\|
−	\| Entity	+	\|width="33%"\| Entity
−	\| SI derived unit	+	\|width="33%"\| SI derived unit
−	\| Symbol	+	\|width="33%"\| Symbol
	\|-		\|-
	\| Area		\| Area
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	\|-		\|-
	\| Luminance		\| Luminance
−	\| candela per square ~~meter~~	+	\| candela per square metre
	\| cd/m2		\| cd/m2
	\|-		\|-

Editor at 18:47, 1 March 2019

2019-03-01T18:47:50Z

← Older revision		Revision as of 18:47, 1 March 2019
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		+	{\|
		+	\| [[File:Metric.jpg]]
		+	\|}
		+
	= Introduction =		= Introduction =

Editor at 18:39, 1 March 2019

2019-03-01T18:39:44Z

← Older revision		Revision as of 18:39, 1 March 2019
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	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =
		+
		+	* Area.
		+	* Chainage.
		+	* Conversion of material volumes.
		+	* Conversion of units.
		+	* International Property Measurement Standards.
		+	* Measurement.
		+	* Notation and units on drawings and documents.
		+	* Space.
		+	* Units.
		+	* Volume.
		+	* Watt.

	[[Category:Education]] [[Category:Theory]] [[Category:Design]]		[[Category:Education]] [[Category:Theory]] [[Category:Design]]

Editor at 18:36, 1 March 2019

2019-03-01T18:36:43Z

← Older revision		Revision as of 18:36, 1 March 2019
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	Traditionally, metric conversion charts and tables would often have been used to convert between different units in the metric system. For example, a table for length and area measurements may show the formulae for how to convert from square kilometres to square metres, or from square metres to square millimetres. Similarly, conversion tables or formulae might be used to convert from imperial units to metric units. More recently, the advent of the internet has ushered in a host of on-line calculators that allow instant and highly accurate conversions once the value to be converted is inputted.		Traditionally, metric conversion charts and tables would often have been used to convert between different units in the metric system. For example, a table for length and area measurements may show the formulae for how to convert from square kilometres to square metres, or from square metres to square millimetres. Similarly, conversion tables or formulae might be used to convert from imperial units to metric units. More recently, the advent of the internet has ushered in a host of on-line calculators that allow instant and highly accurate conversions once the value to be converted is inputted.
		+
		+	= Related articles on Designing Buildings Wiki =
		+
		+	[[Category:Education]] [[Category:Theory]] [[Category:Design]]

Editor: Created page with "= Introduction = The metric system is a decimalised measurement system that is used widely throughout the world for weights and measures in everyday life, trade, science and ind..."

2019-03-01T18:34:13Z

Created page with "= Introduction = The metric system is a decimalised measurement system that is used widely throughout the world for weights and measures in everyday life, trade, science and ind..."

New page

= Introduction =

The metric system is a decimalised measurement system that is used widely throughout the world for weights and measures in everyday life, trade, science and industry. It is used to measure things such as the weight of vegetables, the speed of a train, the height of a child, the intensity of light and the volume of water in a tank.

One of the benefits of the metric system is its relative ease of understanding and application. Being a decimalised system, it is based on the power of 10 and parts of ten. So, there are 10 millimetres (mm) in a centimetre (cm); 100 centimetres in a metre (m) and 1,000 metres in a kilometre (km).

This can be contrasted with the relative complexity of the Imperial system which was not decimalised but based on irregular bases, eg 12 pence in a shilling, 20 shillings in a pound (240 pence); 12 inches in a foot (ft), three feet in a yard (yd) and 1,760 yards (yds) in a mile.

The imperial system also involved fractions that were more problematic when adding up, eg 1ft 3 3/4in plus 4ft 3 5/8in equals 5ft 7 3/8in. The metric equivalent of this addition is 396mm + 1310mm = 1706mm or 1.706m.

= International System of Units =

The term ‘metric system’ has been superseded by ‘International System of Units (SI)’ and the units that are used for measuring, such as kilograms and metres, are called SI Units.

There are seven SI base units that form the foundation of the metric system:

{|
| Quantity measured
| Unit
| Symbol
|-
| Length
| metre
| m
|-
| Mass
| kilogram
| kg
|-
| Time
| second
| s
|-
| Electrical current
| ampere
| A
|-
| Thermodynamic temperature
| kelvin
| K
|-
| Amount of substance
| mole
| mol
|-
| Luminous intensity
| candela
| cd
|}

From the seven SI base units in the table above, other quantities can be derived (derived quantities) by using quantity equations to cover other measurement requirements:

= Derived units =

{|
| Entity
| SI derived unit
| Symbol
|-
| Area
| square metres
| m2
|-
| Volume
| cubic metres
| m3
|-
| Speed, velocity
| metres per second
| m/s
|-
| Mass density
| kilogram per cubic metre
| kg/m3
|-
| Specific volume
| cubic metre per kilogram
| m3/kg
|-
| Luminance
| candela per square meter
| cd/m2
|-
| Current density
| ampere per metre
| A/m
|-
| Dynamic temperature
| degree Celsius
| °C
|}

Some SI derived units have been given special names and symbols such as watt (W) to represent power and radiant flux; joule (J) to represent energy, work and quantity of heat, and newton (N) to represent force.

Traditionally, metric conversion charts and tables would often have been used to convert between different units in the metric system. For example, a table for length and area measurements may show the formulae for how to convert from square kilometres to square metres, or from square metres to square millimetres. Similarly, conversion tables or formulae might be used to convert from imperial units to metric units. More recently, the advent of the internet has ushered in a host of on-line calculators that allow instant and highly accurate conversions once the value to be converted is inputted.