What differences would you except if, at the same time you place a yellow and blue food colouring in both HOT and COLD water?​

The yellow and blue food coloring will spread faster in hot water than in cold. The colors will combine and turn green in the hot water while the colors will remain separate longer in the cold water.

Explanation:

Water molecules are extremely small. The food coloring would move and mix in the hot water more quickly than it would in the cold water.