The pH scale shows how acidic a substance is. ... Lemon juice is acidic (approximately 2 on the pH scale), ... You can use red cabbage to make your own universal indicator.

The light-based sensor can measure pH, ... the cells will die. pH is measured on a scale of 0 (very acidic) to 14 ... Optical fibers and cabbage juice.

Make an acid-base indicator. Dr Yan uses some very colourful science to find out what's acidic in his kitchen. Take 1/4 red cabbage. Finely slice the cabbage. Put all the chopped-up cabbage into a ...