This is gas

Brilliant wall. I managed to find two whole connections and feel pretty pleased with that!

I loved the ideas and great general knowledge, but Newton, Ohm and Faraday in the Laws group can all directly swap with Joule, Pascal and Ampere in the 'scientists with units named after them' group, so the the number of equally valid solutions is in double figures.

Enjoyable on the whole, I spotted all the connections but I failed to solve a single category, simply because there are far too many legitimate permutations. Too many ways you can form different but equally valid groups. I could've continued for another 30 minutes and made more and more ways to connect them.

Yesss lad!