How many ml in 1cl?

1 ml = 1 cc exactly

1 cc = 1 cubic centimetre = 1 cm x 1 cm x 1cm

1 liter = 10 cm x 10 cm x 10 cm = 1000 cm3 = 1000 cc

and 1 ml = 1/1000 of 1 liter = 1/1000 of 1000 cc = 1 cc