Quarts
There is more than one kind of quart:
One US liquid quart is 946ml: US liquid quart
One UK quart is 1.14L: UK quart
UK Barrels
A UK barrel is 36 imperial gallons (not to be confused with American gallons), about 163.659 liters or 0.163659 cubic meters. It is based on the traditional wine barrel used in the United Kingdom.