On 6 Jul 2016 at 0:34, Richard Aiken wrote:

>
> On Tue, Jul 5, 2016 at 7:28 PM, (via tml list)
> <xxxxxx@simplelists.com> wrote:
>     This email was sent from shadowgard.com which does not allow
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>
>     On 5 Jul 2016 at 15:40, David Shaw wrote:
>
>     > Um... According to my sources, 1 hectare is approximately 2.5
>     acres. I > think you're getting mixed up between metres squared
>     and square metres > - 1 hectare is 100m squared, not 100 square
>     metres.
>
>     Ok, that's weird. Because that means that an are is 10mx10m. While
>     a stere is 1m*1m*1m.
>
> Not sure what a "stere" is . . . but since 1 times 1 times 1 equals 1,
> I think there's something wrong there.

The base unit of length in the metric system is the meter. The base
unit of area is the are. A hectare is 100 ares (by definition). The
base units of volume are the liter (well known and originally
intended for liquids (think "quart")), and the rarely used stere
(originally intended for solids (think "cubic yard")).

A liter was defined as both a kilo of water and as 10 cm * 10 cm * 10
cm. (1000 cubic centimeters)

A stere was defined as 1 m * 1 m * 1 m ( a cubic meter.

The are is apparently defined as 10 m * 10 m (100 square meters). A
somewhat odd choice. Not exactly intuitive.

> I think David is saying that a hectare is 100m on a side (e.g. 10,000
> square meters), not 10m on a side (e.g. 100 square meters).

Again, *by definition* a hectare is 100 ares. So that'd be a 10x10
arrangement of 1 are squares.

My mistake was thinking that an are was 1 m^2, rather than 100 m^2.

--
Leonard Erickson (aka shadow)
shadow at shadowgard dot com