18. What is capillarity? How is
this phenomen on chemically
explained? What is the
relevance of capillarity for
water transport in plants?

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Capillarity is the phenomenon
which water moves inside
thin tubes (capillaries) aided the
attraction between water and
the capillary wall. capillarity
phenomenon is possible water
is a polar and forms
intermolecular hydrogen .

Therefore there is electrical
(adhesion force) between the
wall and the water that then
pull each (cohesion force) since
they bound. Not just water
other liquids may move capillaries
by capillarity.

Capillarity not too relevant for
transport of water in . It
contributes only to few centimeters of
ascension.