We have bees flying in a jar, not touching it. Jar is closed and air in it has standard atmospheric pressure. Here is the question: if we put that jar on a weighing-machine, is ti going to show the mass of the bees? I had some theories about it, but many people thought differently, trying to convince me that they are right. I don't believe them - I want to hear your opinion. I apologize if I'm spamming. I'm new here and I searched through many different threads, but I didn't find anything similar.