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Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against ingress of water. I
It is usually accompanied by an indication of the static test pressure that a sample of newly manufactured watches was exposed to in a leakage test.
The test pressure can be indicated either directly in bars, or (more commonly) as an equivalent water depth in meters (in the United States sometimes also in feet).
An indication of the test pressure in terms of water depth does not mean that the watch was designed for use in such water depths.
For example, a watch marked at 30 meters depth cannot be expected to withstand activity in a swimming pool, let alone cotinue to function at 30 meters under water.
This is because the test is conducted only once using static pressure on newly manufactured watches. In practical use, a watch is subjected to variations in pressure which greatly add to the static pressure of the water. Examples of this include the movement of a swimmer's arm through the water, or violent sprays encountered in water skiing. A test suitable for qualifying a diving watch for repeated usage in a given depth would have to include safety margins and an accelerated aging test of the seals.
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Answered by
Uttam
, an ibibo Master,
at
6:54 PM on July 21, 2008