A 50 liter oven can contain 50 liter of stuff, like 50L of any liquid.
In the metric system, conversion between liters and cubic decimeters (or any order of magnitude) is very convenient. 50L equates 50 cubic decimeters (1dm = 10cm), which can for instance correspond to an oven with the dimension 5dm x 10 dm x 1dm, or any other sum that equates 50.
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