My daughter was doing her homework the other day and wanted to know whether she should place gel in the solids or liquids column as she was confused. This was interesting because it was something which most people never think about but gel is used in so many ways every day by just about everyone. The Ultrasound gel used for ECG and the Ultrasound gel for Fetal Dopplers is one such example, as is hair gel and even gel toothpaste.

A gel is a solid, jelly-like material that can have properti...


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