Hello, I'm new!

[ps_bond]

Shear forces in action on Newtonian fluids? It's been a while since I had to use fluid mechanics & Young's modulus in anger...

[Melanie De Castro Pugh]

The sorts of questions that rheology answers are: Why do I have to hit the ketchup bottle for some to come out, and why does it then completely cover my chips? (a most important question)

Welcome, Jo!

I don't often get to use the word "thixamatropic".... It's a property of ketchup whereby the more it is agitated, the runnier it gets. I think. Am I right?

I remembered it especially for the benefit of my eight year old son, who hasn't asked yet.

[Kathryn Harrison]

That sounds like an awesome job! Nice to meet you

[lorraineflee]

Hi Jo and welcome!!!

[Josiejo]

Almost right Mel, ketchup is thixotropic (although I like thixamatropic better and will be pushing for a re-name) and you are right - that's one of the reasons why ketcup covers your chips when you hit it. Thixotropy is a time and shear effect, which means that when you whack it, it becomes runnier but then doesn't rebuild thickness instantly (like shower gel would - go on try to make it stay runny when you shake the bottle!) so you get a lot of ketchup.

so anyway, I sometimes make jewellery!

Jo

[medusa]

if only they could make a ketchup version of silver...