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My Fossil watch says "water resistant up to 330 feet"
- Thread starter antyler
- Start date
mugs
Lifer
I don't think you'll find many watches that say they're waterproof. They all say water resistant. If it just says water resistant, it's good for washing your hands and what have you. If says water resistant and has a depth, you can probably take it to that depth without anything happening.
seems like legit info. According to that, a 100 meter resistant watch can be worn snorkeling. Mine does say 100 meter / 330 feet, so I assume I am at least safe to wear it while i swim, or wash my hands.
I personally dont see a need to risk ruining it though, and would remove it before swimming or snorkeling.
I had a Kenneth Cole "water resistant" watch (not sure of the depth rating). Water got in while I was washing my hands. The watch couldn't have been in contact with running water for more than 1 second. It still worked, but there was condensation behind the crystal. I sent it back to Kenneth Cole and they replaced the watch.
Don Vito Corleone
Elite
Not necessarily. There are a host of 200M-rated divers watches that are available at around $100. You can get a very nice automatic Seiko diver which is perfectly good for SCUBA diving down to 60 or 100 feet for less than $150.
DrPizza
Administrator Elite Member Goat Whisperer
Yep. I can't see 100ft plus swimming in current being anywhere near the pressure experienced at 330ft
Every 33 feet is equal to one atmosphere, so 330 feet is 10 additional atmospheres of pressure. i.e. an extra 147psi. At 100 feet, that's 3 extra atmospheres; roughly an additional 45 psi above surface atmospheric pressure at sea level. I can't see how swimming and current could possibly add 100psi to what the watch case experiences.
Rubycon
Madame President
100M or "10ATM" rating is common in sports watches. Fine for swimming, snorkeling, bathing, etc. Watches that have screw down crowns should NEVER be submersed with the crown unscrewed. Most digital (watches with push buttons) at 100m rating also require that buttons are NOT pressed when the watch is submersed. Doing so breaches the seal and will allow water to creep in. You may not see it right away but the next day the crystal will probably be fogged up and then you have problems.
mugs
Lifer
I think you'd probably want to know how long you'd been under water. I figure that's why dive watches (at least the crappy "dive" watches) have the rotating dial - so you can set it to the time when you went down and tell at a glance how long you've been under water without having to think.
Don Vito Corleone
Elite
These kinds of depth ratings are almost invariably overstated.
As a general rule of thumb, a 50M-rated watch is safe to wash your hands with, as it can sustain a splash without trouble. A 100M watch will generally have a screw-down crown and back, and be safe for swimming. 200M is safe for recreational diving, including SCUBA dives to 100 feet. I have taken one of my 200M Seikos to 60 feet without incident.
Typically watches built for diving deeper than that (which is realistically far outside most owner's real-world use) have either passive or active helium-release valves, to allow helium to escape during ascent in a diving bell (deep-sea diving bells are filled with a combination of helium and oxygen). There are actually watches rated for 1000M or more, but they tend to rely on ridiculously beefy cases and crystals and/or are filled with mineral oil to equalize the inside and outside pressure during very deep dives. It's really kind of an academic issue in that no human can survive the pressure at depths like that.
DrPizza
Administrator Elite Member Goat Whisperer
Physics is my strong point - I teach physics. However, admittedly, I haven't studies fluid dynamics in 22 years, nor have I used fluid dynamics in 20 years. Nor do I teach any fluid dynamics, except to explain to my students how Bernoulli's principle isn't enough to make jets fly, no matter what the idiots may say because they remember their 4th grade teacher telling them that it's Bernoulli's lift that keeps them in the air.
However, I'm not sure if you're aware of this or not, but atmosphere's are not a unit of force. Atmosphere's are a unit of pressure. Pressure is force per unit of area. I see that fluid dynamics isn't your strong point either. My, arm has a lot of surface area, so even a small pressure is going to translate into a larger force.
I do realize that there's an increase in pressure on the leading side of an object moving through a fluid (with a viscosity; which is any normal fluid, including air, and which excludes liquid Helium becoming a "superfluid".) Without a difference in pressures front to back, there wouldn't be drag.) And, I recall that there's a difference between static pressure and dynamic pressure. But, I still wouldn't think that the dynamic pressure is that great of a difference.
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