The liter is not a unit of length, it is a unit of volume. In any event, there are 7000 milliliters in 7 liters.
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Remember K H D | d c m (kilo, hecto, deka, (liter, meter, gram), deci, centi, milli). These are the denominations you need to list when converting metric units. Milliliters are three places to the right of liters. So you have to move the decimal place three times to the right (same as multiplying by 1000). You will get 7.3 L = 7300 mL.
There are 1000 ml in one litre. Therefore there are 1000 x 7 ml in 7 litres. =7000.