In the sentence below:
Das Zimmer ist 14 m² groß.
How the m² is read?
I know in English you say square meter.
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The superindex ² is pronounced quadrat. In combination with meters, you say:
Quadratmeter (engl. square meter[s])
The action to take the square of a quantity is
There's an irregular power left (in the sense that it has its own name, instead of just saying hoch N), namely three:
There also exists the slightly more technical quartisch for the fourth power, e.g.:
In the context of polynomials, the forth power is also biquadratisch.
As was already said, the best way — and the only way for room dimensions — to read m² would be
However, that doesn’t work that well with all units. Everything that relates to area, i. e. the different metres, and the old imperial units like Elle or Fuß, will work. For most other units, it’s slightly preferred to say something like
Beschleunigung misst man in Meter durch Sekunde zum Quadrat.
or shortened informally to
[…] Meter durch Sekunde-Quadrat.
This is also the way, variables in mathematical equations are treated. So if your m² isn’t the unit for the area of a room, but actually mass squared in some formula, you would say
In addition to c.p.s answer, some more units: