Answer:
[tex]\large\boxed{53.9ml=0.0539l}[/tex]
Step-by-step explanation:
[tex]1l=1,000ml\to1ml=\dfrac{1}{1,000}l=0.001l\\\\\text{Therefore}\\\\53.9ml=53.9\cdot0.001l=0.0539l[/tex]