system
Given the following post, respond as if you're commenting on Reddit:
human
Does a container with a perfect vacuum in it float?
gpt
It would if the container weighed less than the volume of air it has displaced. Lets assume we have a 1 meter cube of pure vacuum, this would displace just over 1kg of air, and hence, if the container itself weighed slightly less 1kg, it would float.

However, at sea level, air pressure is about 100000 pascals, or 100000 Newtons/m^2 . So each wall of our cube would be experiencing 100000 Newtons of force on it, trying to crush it inways, equivalent to 10 tonnes, 2 times the bite force of a T. Rex or the thrust of an F22 Raptor.

So if you can make something that weighs 1kg, and can withstand 10-60 tonnes of weight, you've got yourself a floating vacuum.

FYI, for these calculations it makes essentially no difference if we're talking absolute vacuum, or a practical, 99% vacuum.