How will you determine the surface tension of liquid by drop count method?
If the weight of each drop of the liquid is known, we can also count the number of drops which leaked out to determine the surface tension. The drops are formed slowly at the tip of the glass capillary placed in a vertical direction.
What method is used for determination surface tension?
Surface tension is easily measured through the commonly used maximum bubble pressure method, a Wilhelmy balance, or a du Noüy ring tensiometer.
What is the effect of surface tension on number of drops?
The experimental results show that a lower surface tension will result in a higher tangential spread factor and a lower receding rate during the receding stage, for the drop impinging and depositing on a rotating disk. In addition, a lower surface tension of the drop tends to promote the occurrence of splash.
How can you evaluate the surface tension of a liquid experimentally?
One of the methods to measure surface tension of a liquid is to let the liquid drip. Liquid in a capillary tube forms drops at the bottom of the tube. The drops will gradually grow and, when they reach a sufficient size, they will separate from the liquid.
What are the factors affecting surface tension?
As temperature decreases, surface tension increases. Conversely, as surface tension decreases strong; as molecules become more active with an increase in temperature becoming zero at its boiling point and vanishing at critical temperature. Adding chemicals to a liquid will change its surface tension characteristics.
How do you determine the highest surface tension?
1. Note the correlation between the surface tension of a liquid and the strength of the intermolecular forces: the stronger the intermolecular forces, the higher the surface tension.
Which instrument is used in determination of viscosity?
Viscometer
Viscometer, instrument for measuring the viscosity (resistance to internal flow) of a fluid.
How do you break the surface tension of water?
In order for water to flow more easily into these small spaces, you need to decrease its surface tension. You can do this by adding soap, which is a surfactant (a material that decreases the surface tension of a liquid).
Which liquid has the weakest surface tension?
Hexane, C6H14, has the lowest surface tension of all the liquids given here. Hexane is a non-polar molecule, the only intermolecular forces acting between hexane molecules in the liquid will be the weakest of all the intermolecular forces, London forces (also known as dispersion forces).
Which liquid has the least surface tension?
Diethyl ether has the least surface tension as it has the highest vapour pressure amongst the other three.
How is the drop weight method used to measure surface tension?
The drop weight method is an accurate yet simple technique for determining surface tension σ. It relies on dripping a liquid of density ρ at a low flow rate Q from a capillary of radius R into air and measuring the combined volumes of the primary and satellite drops that are formed.
Where does the drop weight method come from?
It relies on dripping a liquid of density ρ at a low flow rate Q from a capillary of radius R into air and measuring the combined volumes of the primary and satellite drops that are formed. The method’s origin can be traced to Tate, who postulated that the volume V
Which is the oldest method for surface tension determination?
This is the oldest method used for surface tension determination. A consequence of the surface tension appearance at the liquid/gas interface is moving up of the liquid into a thin tube, that is capillary, which is usually made of glass. This phenomenon was applied for determination of the liquid surface tension.
How is the surface tension of a liquid determined?
(3) or (4) If the liquid completely wets the capillary walls the contact angle θθθθ= 0o, and cosθθθθ= 1. In such a case the surface tension can be determined from Eq. (5).