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There are several advantages to the metric or SI system. Some of them are:

1. They are internationally agreed as standard. Not like a gallon which can mean one amount in the US and a different amount in the UK.

2. In the metric system, orders of magnitude for the same measure are related by simple decimal conversions and only a handful of prefices are required (although there are a lot more). By way of contrast, the Imperial system uses:

- 2 pints in a quart
- 3 feet in a yard
- 4 quarts in a gallon
- 6 feet in a fathom
- 8 furlongs in a mile
- 9 square feet in a square yard
- 12 inches in a foot
- 14 pounds in a stone
- 16 ounces in a pound

and so on, and on and on. The decimal structure also makes it simple to use scientific notation for very small and very large quantities.

3. It is used by most people in the world. The main recalcitrant countries are USA, Liberia and Myanmar. Even in the US, scientists normally use SI. When they don't they have disasters like the one that trashed NASA's Mars Climate Orbiter!

4. There are many simple relations between measures for one characteristic to another. For example, the SI unit of length is 1 metre. 100 square metres = 1 are, the unit for area. 1 cubic metre = 1000 litres, the unit for volume.

Q: Why did imperial measuring change to metric?

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No. A pound is part of the Imperial measuring system not the metric system.

They are both systems of measurement in which there are sets of 7 units for measuring physical attributes of objects and derived units for measuring other attributes. For example, Basic units for mass: Kilogram (metric) or Pound (Imperial) Derived units for area: Square Metre (metric) or square inch (Imperial) Derived unit for pressure: kg / sq metre = Pascal (metric) or pounds / square inch = psi (Imperial).

Imperial.

A tonne is a metric measurement.

I'm guessing by customary, you mean imperial. if so inches are customary/imperial

Related questions

Metric or Imperial

To simplify the system. The decimal or metric system makes the task of measuring weight, volume, length,or money calculation so much easier.

The units for measuring time are the same in the metric and Imperial systems: seconds, minutes, hours, days and so on.

no-one

No. A pound is part of the Imperial measuring system not the metric system.

1970

1972

They are both systems of measurement in which there are sets of 7 units for measuring physical attributes of objects and derived units for measuring other attributes. For example, Basic units for mass: Kilogram (metric) or Pound (Imperial) Derived units for area: Square Metre (metric) or square inch (Imperial) Derived unit for pressure: kg / sq metre = Pascal (metric) or pounds / square inch = psi (Imperial).

You would use meters for measuring length in the metric system, which is the standard unit for length. Inches are used in the imperial system for measuring length.

Imperial and metric systems of measurement can be interpreted by a metric conversion table and chart. The measuring scheme is available from various online companies like French Property Company.

The two main measuring systems used in the world are the metric system and the imperial system. The metric system is used in most countries and is based on units such as meters, grams, and liters. The imperial system is primarily used in the United States and includes units like inches, pounds, and gallons.

A gallon is certainly not metric. It is imperial.