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Senses and their thresholds of sensitivity

The threshold values shown are very approximate and are for ideal conditions

• Sight A candle flame visible on a dark, clear night at a distance of about 2.5 km (previously it was thought that the distance could be 50 km, but this has not been confirmed by experiments)
• Hearing Ticking of a clock in silence at a distance of 4 m
• Smell A few molecules of odorous substance per square centimeter of air
• Taste One teaspoon of sugar without a slide (5 g) per liter of water
• Touch The wing of a bee dropped on a person's back from a height of 1 cm

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