  Nanofluidics has firmly established itself as a new field in fluid mechanics,
as novel properties have been shown to emerge in fluids at the nanometric
scale. Thanks to recent developments in fabrication technology, artificial
nanofluidic systems are now being designed at the scale of biological
nanopores. This ultimate step in scale reduction has pushed the development of
new experimental techniques and new theoretical tools, bridging fluid
mechanics, statistical mechanics and condensed matter physics. This review is
intended as a toolbox for fluids at the nanometre scale. After presenting the
basic equations that govern fluid behaviour in the continuum limit, we will
show how these equations break down and new properties emerge in molecular
scale confinement.
