Humans of Physics V: Guillaume Berthet

This is the fifth installment of Humans of Physics, a series focusing in the researchers more than in the research, for once.

The first time I entered in the room where the cold atom experiment was, I couldn’t express what I felt… Wires everywhere, optical fibers sending lasers all over the room, a metallic vacuum chamber hidden by a huge amount of copper wire, optical fibers and water cooled magnetic coils… A big mess. My supervisor asked me to have a look inside the vacuum chamber through a thick glass. After five minutes trying to find the right angle I finally saw it. A red bubble surrounded by darkness. This was a billion atoms trapped in the vacuum… I was really impressed.

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What is Mass? Part I

This is the second installment of our “What is…?” series. 

During these months of quarantine, a lot of us have probably thought once or twice that we have been putting on some quarantine-weight. And while that is true (or not, for you, athletic reader) what is actually happening, is that you body is acquiring mass. A somewhat trivial difference, you may say, as weight is just the force inflicted by gravity on to some body. And it strikes me as a funny thing that in our everyday physics, everything comes intuitively to us, force, speed, acceleration, rotation stuff. Everything -but mass. It feels intuitive, but the more you think about it, the more you will end up asking yourself… What is mass?

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