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A 500 ml hand sanitizer refers to a half-liter-sized bottle containing sanitizing gel or liquid, typically used for disinfecting hands to prevent the spread of germs, bacteria, and viruses. These sanitizers often contain alcohol as the active ingredient, usually around 60% to 70% concentration, which effectively kills most germs on contact. The 500 ml size is convenient for both personal and commercial use, providing several applications before needing replacement. It's commonly found in homes, offices, healthcare facilities, and public places as a convenient hygiene solution, especially in situations where hand washing with soap and water is not readily available.