What is force tensiometer?
Table of Contents
What is force tensiometer?
Force Tensiometers employ a simple and robust technique to measure surface tension, interfacial tension and density of liquids.
How does a tensiometer work surface tension?
Wilhelmy Plate Tensiometer – uses a plate that makes contact with the liquid surface. The plate is placed perpendicular to the interface, and the force exerted on it is measured. Surface scientists consider this tensionmeter the simplest and most accurate for measuring surface tension.
What can be calculated using tensiometer?
The negative pressure or matric potential can be measured with the so-called tensiometer. The tensiometer consists of a liquid filled porous cup, mostly of ceramic material and connected to a pressure measuring device such as a mercury manometer or vacuum gauge via a liquid-filled tube (figure 7).
How does an optical tensiometer work?
An optical tensiometer records drop images and automatically analyzes the drop shape. The drop shape is a function of the surface tension of the liquid, gravity and the density and humidity difference between sample liquid and surrounding medium.
Who designed tensiometer first?
The invention of the tensiometer for measurement of soil water matric potential is commonly attributed to Willard Gardner, with the first robust design for field applications attributed to Lorenzo A. Richards during the early 1920s.
What is the other name of tensiometer?
Goniometer/Tensiometer Surface tension can be automatically calculated from the pendant shape of a liquid droplet. Surface scientists use a goniometer/tensiometer to measure contact angle, surface tension, and interfacial tension.
What are the advantages of tensiometer?
Tensiometers are relatively inexpensive and reusable. They are simple to operate, although they require some maintenance in the field. Maintenance requires the addition of water and the use of a hand vacuum pump to remove air from the tube.
How do you calculate pressure from surface tension?
The force do to the pressure difference must balance the force from the surface tension. The force to the pressure difference is (Pi – Po)πr2. For a single spherical surface balance is achieved if Pi – Po = 2γ/r. This is known as Laplace’s law for a spherical membrane.
Why do we need surface tension?
Surface tension determines the efficiency of detergent formulation. The high surface tension of water makes it a relatively poor cleaning detergent. By increasing the temperature of water (as is often done when washing clothes or dishes), the cleaning efficiency increases slightly as surface tension decreases.
How do you use a tensiometer on an aircraft cable?
In the field, mechanics routinely use cable tensiometers to check tensions on aircraft control cables. The process is simple: Clamp the tensiometer on the cable, take a reading, compare it to the calibration chart with the tool (referencing cable size), and you get the resulting tension.
What is a good contact angle?
Generally, if the water contact angle is smaller than 90°, the solid surface is considered hydrophilic and if the water contact angle is larger than 90°, the solid surface is considered hydrophobic.
