For more effective hand washing, which temperature of water is preferable?

Warm water is considered the most effective temperature for hand washing because it helps to dissolve soap and remove dirt and grease more efficiently than other temperatures. At a warm temperature, the thermal sensation encourages a more thorough hand scrubbing, which can lead to better hygiene. Warm water also enables the soap to effectively emulsify oils and microbes present on the skin, which is essential for proper cleaning.

While cold water might not be effective in dissolving soap, hot water can sometimes be too harsh on the skin, potentially leading to irritation or dryness, which may discourage frequent hand washing. Room temperature water falls short of the optimal benefits provided by warm water for effective hand washing, even though it may be better than cold. Therefore, warm water strikes a balance that maximizes cleaning effectiveness while also being comfortable for users, making it the ideal choice for proper hand hygiene.