Math is Fun
February 27, 2012 7:02 PM Subscribe
What are some ways to accurately measure the volume of very small amounts of liquid without complex equipment?
posted by WhitenoisE to science & nature (23 answers total) 3 users marked this as a favorite
I need to accurately measure the volume of droplets between let's say 0.1 to 2 μL. I cannot use a calibrated micropipette tube because the smallest ones available (10μL) are too big for the liquid to sit evenly.
I tried placing the droplets on a wax surface and measuring diameter with a micrometer, but there's no way I know of to calculate volume with this diameter since the droplets aren't spheres when resting on a surface. I think I would need a contact angle goniometer to begin to analyze the geometry.
I guess I can try placing the drops in oil and calculating the area that way but in reality I've tried different types of oil and the drops don't stay in a nice easy shape.
I have access to basic chemistry glassware and equipment but nothing fancy.