Sanitation Certification Practice Test

What temperature should water be when wetting hands for proper hand washing?

1. Above 120 F

2. Approximately 100 F

3. At room temperature

4. Below 80 F

The correct answer is: Approximately 100 F

For effective hand washing, the recommended water temperature is approximately 100°F. This temperature is warm enough to help dissolve oils and grime on the skin while also being comfortable to the touch. Warm water encourages individuals to wash their hands for a longer duration and enhances the lathering of soap, which is crucial for removing pathogens. Additionally, using water that is too hot can lead to skin irritation or burns, making the hand washing experience uncomfortable and potentially leading to avoidance of proper hygiene practices. Conversely, cold water (like room temperature or below 80°F) may not be as effective in breaking down fats and oils on the skin, possibly leading to less effective sanitation, which is why the choice of approximately 100°F stands out as the optimal temperature for hand washing.