I need to weigh a small item. Let's assume that it's up to 20 pounds (~9 kg).
A tabletop scale would make this really easy,
but unfortunately none is available.
Given other household items, is there a way to do a quick measurement faster than running out to a store and buying a new scale?
My first thought's to place the item in a small bucket, put it in a sink/tub, then measure the approximation water displacement to back-calculate the weight. But that'd seem to waste a lot of water.
Basically the same as (1), but using two cups or bottles of different sizes instead of a bucket and tub/sink. Could extend this to handle high-volume items by balancing the item to be weighed in the center container to use it as a plunger, but would still seem to need an outer container that has sufficient volume for heavier items.
Maybe using something like floss to do some sort of pulley-based system against a known weight?