A kawaii cute version of the chemistry science joke about molar concentration. Moles per litre (mol/l) – the number of molecules or ions per litre. Here’s 4 moles per litre! This is popular with chemistry educators / teachers, for themselves and as secret santa gifts at Christmas. It makes a great nerdy t-shirt.
Where you can buy online
Buy this design on a non-medical face mask from my RedBubble US store.
You can find the design on t-shirts in most stores, but also on other products depending on the store (e.g. hoodies, mugs, stickers, notebooks, phone cases, greeting cards, cushions, socks etc).