Why does hot water clean better?
Show answer & explanation
Answer: Heat helps dissolve grease
Heat kills all germs — Wrong. Normal hot water isn't hot enough to kill most germs. Sanitizing requires much higher temperatures or chemicals.
Heat helps dissolve grease ✓ — Correct! Heat makes molecules move faster, helping break bonds in grease and oils. It also helps soap work better by lowering surface tension further. Grease literally melts and washes away more easily!
Hot water has more oxygen — Wrong. Hot water actually holds less dissolved oxygen than cold water. Cleaning power comes from molecular energy, not oxygen content.