What is vapour pressure,surface tension and viscosity?

Question

of a liquid. can any1 please explain all of these to me briefly

Answer 1

Vapor pressure is the particular pressure at which a substance can simultaneously exist as both a vapor and a liquid. It varies with temperature, and is also called the saturation vapor pressure. Surface tension is a "skin" formed at the boundary of a fluid due to cohesion of the fluid particles. Water is well known for its surface tension, and surface tension is what allows freestanding bubbles to form, for example. Viscosity is a fluid's resistance to flow. The more viscous a fluid is, the "thicker" it seems. Water is not very viscous, but molasses is extremely viscous

Answer 2

Vapour pressure is the absolute pressure.
Defined as that absolute pressure at which the vapour contained in a substance is at equilibrium with its liquid or solid phase. Significant for centrifugal pump technology is only the actual transition between gaseous and liquid phases.
In physics, surface tension is an effect within the surface layer of a liquid that causes the layer to behave as an elastic sheet. It is the effect that allows insects (such as the water strider) to walk on water, and causes capillary action, for example.

Surface tension is caused by the attraction between the molecules of the liquid, due to various intermolecular forces. In the bulk of the liquid each molecule is pulled equally in all directions by neighboring liquid molecules, resulting in a net force of zero. At the surface of the liquid, the molecules are pulled inwards by other molecules deeper inside the liquid, but there are no liquid molecules on the outside to balance these forces. (There may also be a small outward attraction caused by air molecules, but as air is much less dense than the liquid, this force is negligible.) All of the molecules at the surface are therefore subject to an inward force of molecular attraction which can be balanced only by the resistance of the liquid to compression. Thus the liquid squeezes itself together until it has the locally lowest surface area possible.
Viscosity is a measure of the resistance of a fluid to deform under shear stress. It is commonly perceived as "thickness", or resistance to pouring. Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction. Thus, water is "thin", having a lower viscosity, while vegetable oil is "thick" having a higher viscosity. All real fluids (except superfluids) have some resistance to shear stress, but an idealized fluid which has no resistance to shear stress is known as an ideal fluid.

Answer 3

Vapor pressure is the particular pressure at which a substance can simultaneously exist as both a vapor and a liquid. It varies with temperature, and is also called the saturation vapor pressure. Surface tension is a "skin" formed at the boundary of a fluid due to cohesion of the fluid particles. Water is well known for its surface tension, and surface tension is what allows freestanding bubbles to form, for example. Viscosity is a fluid's resistance to flow. The more viscous a fluid is, the "thicker" it seems. Water is not very viscous, but molasses is extremely viscous.

Answer 4

I'll try in layman terms.

Vapor pressure is the rate that a liquid is evaporating (ie: when the vapor pressure is the same as the atmospheric pressure, the liquid is at it's boiling point)

Surface tension is when a liquid creates an unequal force on it's surface, and seems to have a membrane.

Viscosity is the resistance a fluid presents to flow.

Answer 5

vapour pressure is the pressure of the energetic liquid molecules in vapour phase above the surface of the liquid at room temperature.
surface tension is that property of a liquid due to which its surface acts like stretched membrane and any point on the surface experiences a force.
viscosity is basically the resistive/drag force acting between two layers of the liquid when it is in motion.

Answer 6

you need a complete chemistry lesson.

Answer 7

i agree with leprechaun