the kor: the largest of ancient Israel's measures of capacity, equal to ten baths or one homer and holding roughly two hundred liters (about six bushels)
A kor was not a weight but a volume, the amount a fixed container held. It sat at the top of Israel's scale of capacity measures: ten times the bath (בַּת) used for wine and oil, and ten times the ephah (אֵיפָה) used for grain. Ezekiel states that equivalence outright and also identifies the kor with the older homer (חֹמֶר), the load a donkey could carry. The best estimates put a kor somewhere near two hundred liters, though that figure is reconstructed from ancient jars rather than known.
Almost every time the word appears, a king is moving food in bulk. Solomon's household gets through thirty kors of fine flour and sixty of ordinary flour in a single day; he ships Hiram of Tyre twenty thousand kors of wheat a year; the defeated Ammonites pay Jotham ten thousand kors of wheat and as much barley again; and the Persian king authorizes Ezra to draw up to a hundred kors of wheat from the provincial treasury. This is the unit of state supply lists and tribute records, which is why the numbers attached to it run so high.
Two details are worth noticing. The kor belongs to the dry side of the system, so grain, barley and milled flour are its normal contents, and the two places where oil is counted in kors stand out (in one of them the ancient Greek translation and the parallel account in Chronicles both give the oil in baths instead). And the word travels easily between languages: it appears in the Aramaic of the Persian decree quoted in Ezra, and the New Testament simply keeps it in Greek (κόρος) when a debtor in one of Jesus's parables owes a hundred kors of wheat.