# The surface tension of a liquid at its boiling point is what?

• nishant
In summary, at the boiling point of a liquid, the surface tension is reduced but not completely eliminated. This is because the same-same bond strength decreases while boiling, leading to a decrease in surface energy and relative forces between molecules on the surface. This results in a considerably lower surface tension, although it is not zero and varies from liquid to liquid. At the critical temperature, the surface tension is exactly zero as the intermolecular forces between liquid and gas balance each other.
nishant
the surface tension of a liqud at its boiling point is what?

is it zero?

At the boiling point we still have the liquid as well as have the gas/vapour.
So we have 2 different state of teh same object.
Naturally then the rules we apply for the liquid applies at that point to...which means, the liquid still has a surface tension, but it is reduced. It does not drops to zero.
To get a feel, think of a better liquid, like mercury!
It is reduced because the same-same bond strength [Non-Techie Version of the Bonding!] reduces while boiling
.

Suppose the Surface Tension Of A Liquid is 'S' in normal conditions. As with increase in temperature some of the atoms escape the liquid surface,surface energy decreases and hence relative forces between the molecules on the surface decreases and hence Sufrace tension decreases.Therefore at Boling point , Surface Tension decreases considerably. Therefore the value is ofcourse not zero but quite less than the normal value and the value varies from liquid to liquid.

so it is not so that it cannot be found?

At Boiling pont:: Surface Tension approaches Zero

At Critical Temperature: Surface Tension is exactly zero

Because at critical temperature the intermolecular forces between liquid and gases balance each other and hence liquid expands without any restriction.

## 1. What is surface tension?

Surface tension is a physical property of liquids that describes the force exerted on the surface of a liquid due to the attraction between molecules. It is the ability of a liquid to resist external forces and maintain its shape.

## 2. What happens to surface tension at the boiling point of a liquid?

At the boiling point of a liquid, the surface tension decreases. This is because as the temperature increases, the kinetic energy of the molecules also increases, causing them to move more vigorously and break the cohesive bonds that create surface tension.

## 3. How does surface tension affect the boiling point of a liquid?

The surface tension of a liquid can influence its boiling point. If the surface tension is high, it will require more energy to overcome the cohesive forces and reach the boiling point. On the other hand, a low surface tension will result in a lower boiling point as less energy is needed to break the bonds.

## 4. What factors can affect the surface tension of a liquid at its boiling point?

The surface tension of a liquid can be affected by various factors such as temperature, pressure, and the type of molecules present in the liquid. For example, an increase in temperature or a decrease in pressure can cause a decrease in surface tension.

## 5. How is surface tension measured at the boiling point of a liquid?

Surface tension can be measured using a tensiometer, which measures the force needed to stretch a liquid surface. At the boiling point, the surface tension can be determined by measuring the force needed to break the surface and form bubbles.

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