Calculate the number of molecules remaining in an electronic vacuum tube of capacity 180 cm3 which has been evacuated and sealed off at 25 oc to a pressure of 1. 0 * 10-7 mmhg.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

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the answer is c

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