Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Correction for surface tension-induced errors. The effect of capillary forces and surface tension can be corrected by drawing a circle that fits the curvature of the oil/water interface and measuring its radius. The difference between the curvature before and after impalement provides a correction factor to be subtracted from the calculation. Bar = 25 μm. [See online article for color version of this figure.]
