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At the critical drying point, there is no surface tension between ________________

(a) gas and oil

(b) gas and liquid

(c) liquid and liquid

(d) oil and liquid

This question was posed to me in an interview for job.

This intriguing question originated from Techniques in portion Techniques in Cell Biology of Cell Biology

1 Answer

+1 vote
by (700k points)
Correct option is (b) gas and liquid

To explain: Critical drying point is the technique used to prepare samples for the scanning electron microscopy (SEM). At this point the density of the liquid and the gas is equal and hence there is no surface tension between the two.

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