Question:
Which of the following instruments can measure contact angle of a liquid drop placed on a surface?
Which of the following instruments can measure contact angle of a liquid drop placed on a surface?
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Remember: Contact angle measurements (wettability studies) are done using a goniometer, while pycnometers measure density, Soxhlet apparatus is for extraction, and rheometers measure flow properties.
Updated On: Aug 29, 2025
- Goniometer
- Pycnometer
- Soxhlet apparatus
- Rheometer
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The Correct Option is A
Solution and Explanation
- The contact angle of a liquid drop placed on a solid surface is an important parameter to study surface wettability and interfacial properties.
- A Goniometer is specifically designed to measure the contact angle by analyzing the profile of a liquid drop placed on a solid surface. It captures the drop image and calculates the angle formed at the three-phase boundary (solid–liquid–air). Hence, (A) is correct.
- A Pycnometer is used to measure the density of liquids. It has no relation to contact angle measurement, so (B) is incorrect.
- A Soxhlet apparatus is used for continuous extraction of compounds (mainly in chemistry/food industry applications). It does not measure contact angles. Thus, (C) is incorrect.
- A Rheometer is used to study the flow and deformation behavior (rheology) of fluids. It measures viscosity and viscoelastic properties, not contact angle. Hence, (D) is incorrect.
- A Goniometer is specifically designed to measure the contact angle by analyzing the profile of a liquid drop placed on a solid surface. It captures the drop image and calculates the angle formed at the three-phase boundary (solid–liquid–air). Hence, (A) is correct.
- A Pycnometer is used to measure the density of liquids. It has no relation to contact angle measurement, so (B) is incorrect.
- A Soxhlet apparatus is used for continuous extraction of compounds (mainly in chemistry/food industry applications). It does not measure contact angles. Thus, (C) is incorrect.
- A Rheometer is used to study the flow and deformation behavior (rheology) of fluids. It measures viscosity and viscoelastic properties, not contact angle. Hence, (D) is incorrect.
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