ATM was derived from the mean air pressure that prevails at sea level & corresponds to the value 1 ATM. This pressure is caused by the weight of the earth’s atmosphere. If you now dive sầu inkhổng lồ the water, then for every 10 meters of diving depth, there is also about 1 ATM or 1 bar hydrostatic water pressure in addition to lớn the atmospheric air pressure of 1 ATM or 1 bar. At a water depth of 50 meters, a watch is then exposed lớn an overpressure of 5 ATM or 5 bar.

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ATM was derived from the mean air pressure that prevails at sea màn chơi & corresponds khổng lồ the value 1 ATM. This pressure is caused by the weight of the earth’s atmosphere. If you now dive sầu into lớn the water, then for every 10 meters of diving depth, there is also about 1 ATM or 1 bar hydrostatic water pressure in addition to lớn the atmospheric air pressure of 1 ATM or 1 bar. At a water depth of 50 meters, a watch is then exposed lớn an overpressure of 5 ATM or 5 bar.

## What does 5 ATM mean?

5 ATM means that a watch can withst& a pressure of 5 bar or a water column of 50 meters. In practice, this corresponds lớn the pressure of a flowing water jet when washing hands, showering or bathing. 5 ATM does not mean that a watch is waterproof to a depth of 50 meters, but that it can withstand the pressure of a water column of 50 meters. Because when swimming, the swimming movements can cause pressure peaks that are much higher than 5 bar. Due lớn these pressure peaks, only watches with the designation 10 ATM or higher are suitable for swimming.

## Water resistance of watches: categories & legal regulations

In addition to lớn 5 ATM, there are also the categories 3 ATM, 10 ATM, trăng tròn ATM, etc. We will now take a closer look at what this information means, what you have sầu lớn consider & what legal regulations exist for specifying the water resistance of watches.

### Water resistance classification according to ISO 2281 và DIN 8310 September 2010

** **The standards DIN 8310 (time measurement technology – water resistance of watches – requirements and tests) và ISO 2281 regulate the criteria for the constructions và kiểm tra pressures that watches have to lớn withst& in order khổng lồ be suitable for a certain water resistance.

If there is only “water resistant” on the bottom of a watch, this means that the watch is resistant to sweat, drops of water, rain, etc. in daily use. To get this designation, the watch must survive sầu 30 minutes in 1 meter water depth và 90 seconds in trăng tròn meter water depth without water penetrating inlớn the case.

If there is an indication in bar or atm after the “water resistant”, then the kiểm tra conditions have sầu been tightened và the watches have a higher water resistance or water pressure resistance.

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### These criteria are regulated by the standards DIN 8310 & ISO 2281:

10 bar ≈ 10 atm (≈ 100 m): watches marked 10 ATM withst& a chạy thử pressure of 10 bar và are suitable for swimming and snorkeling.As a reminder: The indication of 50 meters on a watch with the designation “water-resistant 5 ATM” does not mean that the watch is suitable for diving up khổng lồ 50 meters, but that it can withstvà the pressure of a water column of 50 meters.

For professional diving watches that can be used for scutía diving, the maximum diving depth is very often indicated in meters (m) or feet (ft) directly on the dial.

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## Waterproofness information should be checked regularly

Since the water resistance of watches deteriorates over time due to lớn the natural wear of the seals as well as sweat or acids & generally by wearing the watch, the information on the case back only applies to new watches.Also, strong temperature fluctuations e.g. in winter, can cause that the different materials that trang điểm a watch case can expvà differently.

If you want lớn wear your watch e.g. while swimming or diving & want to be sure that the watch still has the specified water resistance, we recommkết thúc that you have sầu your watch checked for water resistance regularly.

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A regular kiểm tra of the seals prevents water damage & the associated expensive sầu repairs.

Chuyên mục: Tin Tức