Water-resistance: 100m under water equals 11kg of pressure!
by Dino Standjofski on February 7, 2008
tagged as: watches hydromax br02 bell & ross tides corum
Water-resistance means a watch is sealed against dust and water. It refers to the pressure the watch can withstand, measured in atmospheres or bars. Pressure is a force applied to a surface where 1 bar = 1 kg / sq. cm.
There are two types of pressure:
- Relative or hydrostatic pressure which is the pressure exerted by water.
- Absolute pressure which is water pressure + atmospheric pressure.
The water-resistance indicated on a watch usually corresponds to relative pressure. During diving, the pressure on the watch is absolute pressure. At sea level (zero altitude), atmospheric pressure equals 1 bar and increases by 1 bar for every 10 metres below sea level.
- 10 metres = 2 bars
- 20 metres = 3 bars
- 100 metres = 11 bars
Freshwater has a density of 1, meaning one litre of fresh water weighs 1 kg. Saltwater has a density of 1.026 because of the salt it contains. In reality, relative pressure increases by 0.98 bar in freshwater and by 1.007 bars in saltwater.
Here are some examples of water watches:
- Corum Tides 48 is resistant to 300 meters = 31 bars
- Bell & Ross BR02 is resistant to 1000 meters = 101 bars
- Bell & Ross Hydromax, deepest watch in the world, resistant to 11,100 meters = 1111 bars
Its Always High Tide with the Corum Tides 48
by Dino Standjofski on December 13, 2007
tagged as: watches tides corum
The 48mm Corum Tides 48 18k rose gold is one of the most gorgeous watches we've seen of late. No wonder this Corum is the hardest and most sought after watch in the line. The twelve sided case is totally unique and is perfectly balanced, giving it a striking look especially with black dodecagon bezel.
The dial gives you the impression of it being a chronograph, with the textured and beautifully finished subsidiary dials for the tide functions, showing the Lunar (where the tides come in on average every 12hrs 25 minutes).The Admirals Cup Tides 48 provides all the important information about the tides, the Lunar month, the strength of the tide, an estimate of the higher water and current strengths, as well as the time of the tides.
Very impressive on the wrist especially the comfort of the rubber strap, the Stainless Steel Tides 48 versions also come with a massive Stainless Steel bracelet.
