Why doesn't Wi-Fi work underwater? - 1
I know it's obviously not MEANT to work underwater, but why does it not work AT ALL? I went underwater with my iPhone 5 in a waterproof case and as soon as I went in the water I got zero reception.
Poor Wi-Fi connection? Wi-Fi does work underwater.
Outside the visible spectrum, electromagnetic waves travel slower in water, but that doesn't affect the data rate. It will just add maybe a microsecond to packet response times. The real problem is absorption. Water is a strong absorber of electromagnetic waves outside a narrow band in the visible spectrum. For frequencies in the 1-10 GHz range, where most fast Wi-Fi lives, the absorption constant is greater than 10 cm^-1, which means that a signal loses half it's strength in (1 / (10 cm^-1. = 0.1 cm or less. The absorption gets smaller at lower frequencies, but doesn't do so quickly. Military grade VLF transmitters can penetrate around 200m of sea water, this is at frequencies of 3-30 KHz. The data rate in bits would be far less than dial-up modems at that frequency.
- Why doesn't Wi-Fi work underwater? I know it's obviously not MEANT to work underwater, but why does it not work AT ALL? I went underwater with my iPhone 5 in a waterproof case and as soon as I went in the water I got zero reception. I have an iPhone 5.
- Why does the iPhone 4 lifeproof case only go up to 6.6 feet underwater? I'm going to buy one of these case but I'm just curious to what happens if you go further than 6.6 feet?
- Why can't I take an underwater picture with my iPhone 4s? I bought the life proof case and it says you can't take underwater pictures, but when i touch the screen it does't do anything. I have to be above water if I want to open the lock screen It will not let me touch the screen under water. Why? I bought it yesterday along with the phone and have taken it in the water twice.
- What underwater iPhone case should I get so I can take pictures underwater? I have an iPhone 5c and I would like to take it underwater to take pictures this summer in a pool. Any cases out there that I can get made for this?