a ball formed of liquid and containing air or gas, e.g. one that forms in boiling water

globule of air

to be in a state of (social or political or personal) excitement or trouble; (to cause a substance) to change chemically through the action of organic bodies (especially yeast) that change glucose into alcohol, e.g. in beer, wine

substance causing chemicals to split into simpler substances

a mass of small bubbles; foam

lather, bubbles