Ketchup is delicious, but also different to other liquids we are familiar with. Newtonian fluids like water pour faster the more we tilt the container they are in - this is because they have a linear relationship between force and acceleration. Tomato ketchup however is a shear thinning non-Newtonian fluid which means its behaves like a thinner liquid when there is force applied, and can behave more like a solid where there is little to no force supplied. Knowing this is super helpful when it comes to pouring ketchup from a glass bottle, so here are my quick tips:
1 - Shake the bottle with the lid on
2 - Remove lid and hold bottle at a 45° angle
3 - Gently tap neck of the bottle, increasing in force until you get the flow rate you want.
Also please ignore the title in the video - I'm not actually a Tomato Sauce Scientist 😂
Full video on Seven Sharp at https://fb.watch/63OSo5BC-h/