I want to measure the avg. inner cross-section area of a flexible tube of outer diameter 5mm. Since the cross-section isn't a circle exactly, use of vernier caliper to measure inner diameter fails. The idea that I wish to try is, to take a tube of known length, fill it with water, then pour the water on to something like a volume flask and from the volume obtained compute the cross-section area.
My questions are, 1 - how valid does this method sound? 2 - Is there a better way to do this? 3 - How much error would the water stuck in the tube due to surface tension introduce?
Would appreciate any help. Thanks.