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maze
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Could a tiny sugar ant walk on a soap bubble? Would the bubble burst? Would the ant be able to locomote along the surface or would it get stuck?
maze said:Usually I have to keep things super clean or else ants will take over, but now that I'm actually looking for sugar ants to drop on a soap bubble, I can't find any.
:/
Andy Resnick said:People are not considering the fact that soap bubbles have *two* interfaces; the soapy water is a thin film.
Given that the interfacial energy of pure water in air is about 70 dyn/cm (70 erg/cm^2), say the interfacial energy of soapy water about 10 dyn/cm.
An ant weighs about 3 mg, so each 'foot' has 0.5 mg spread over (say) 0.1 mm^2. 'g' ~ 1000 cm/s^2, so each foot exerts about 0.5 dyn/mm^2 (5*10^-3 dyn/cm^2) pressure.
The pressure jump across one interface of a 5 cm diameter soap bubble is 2* 10 dyn/cm * (2/2.5 cm) = 16*dyn/cm^2. This is much higher than the foot pressure of an ant, so the ant's weight should be supported by the bubble.
maze said:Ok, I found an ant and dropped it on a soap foam. The bubbles were about 1/2 the size of the ant (ie: 2 bubbles = 1 ant).
The ant basically got stuck in the top layer of foam, immobilized. I believe its body geometry was serving as boundary conditions for the foam surface. After about a second of just sitting there, it spazzed out kicking its legs every way, which caused it to sink slightly to the 2nd or 3rd layer, and then after a couple seconds it stopped moving so I took it out. I think it died, which I didn't expect to happen (especially not after only a few seconds). I don't think I will be trying again since it seems a pretty cruel way to go.
Yes, it is possible for an ant to walk on a soap bubble. However, it is not a common occurrence and requires a specific set of conditions to be met.
The ant must be small and lightweight enough to not break the surface tension of the soap bubble. The bubble itself must also be strong enough to support the weight of the ant. Additionally, the humidity and temperature of the air can affect the stability of the bubble.
Surface tension is the force that acts on the surface of a liquid and allows it to resist external forces. In the case of a soap bubble, the surface tension is strong enough to support the weight of the ant without breaking.
There are no known benefits for an ant to walk on a soap bubble. It is likely an accidental occurrence and not a deliberate behavior.
Yes, other small and lightweight insects or animals may also be able to walk on a soap bubble under the right conditions. Some examples include spiders, water striders, and certain types of beetles.