Shouldn’t the air pressure crush them until the density inside equals the density outside? Why does helium balloon behave so differently from a vacuum-filled balloon?
Shouldn’t the air pressure crush them until the density inside equals the density outside? Why does helium balloon behave so differently from a vacuum-filled balloon?
That’s a great point about the water. In OP’s mental model, an air-filled ballon should be almost completely crushed in even the shallowest water.