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Water is not 100% transparent. And if we are talking about a river or the sea, it contains much more substances and particles than pure water. So, light suffers reflection and refraction when entering the water. So, after some meters under water, light cannot continue propagating. We need air in front of our iris to be able to focus. Our eyes werent designed to see underwater or there would be a clear membrane over the iris to be able to percieve depth underwater. Without either of these, you are only able to see a unfocused image. We need goggles or a mask to fix this.
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∙ 16y ago
Wiki User
∙ 15y agoDue to the inherent visibility and charisma of our fellow land-dwelling animals, it is often easy to forget that vertebrate life, and therefore the vertebrate eye, originally evolved in the water. Indeed, even those organisms that migrated to dry land found ways to keep their eyes bathed in salt water. So, as the ocean is the birthplace of the eye, it is useful to examine the intricate adaptations needed to see in a watery world. As anyone who has gone Scuba diving or swam in a lake with eyes open knows - there is not as much light underwater. Not only does water absorb light incredibly faster than air, but also scatters it in the three dimensions. Thus, the remarkable vertebrate eye evolved in a rather darkened realm where pressures changes significantly as animals move up and down. Fish eyes are quite basic in that they have a fixed iris and so adjust to different light levels in a different way from ours. However, the fish has a sensory line down each side which is very sensitive to sound and movement and augments awareness; a godsend at depths where there is little to no light at all.
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∙ 13y agoPeople have survived being 100 meters underwater, but anything further than that would break bones and cause the lungs to collaspe killing them.
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∙ 14y agoYes, you can hear underwater. Since sound is the vibration of atoms, if a noise is made, you can still hear underwater since the water molecules still vibrate.
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∙ 13y agoYes If you try really hard
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∙ 11y agobecause they just cant
Wiki User
∙ 12y agoYes.
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∙ 11y agoYES
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Why is it hard for humans to hear underwater?
it's hard for people to hear underwater because of the presure of the water...i think! lol
Can a human convert chemical energy to mechanical energy?
sure. why Humans convert chemical energy from food into mechanical energy when they breathe, pump blood, or move any part of their body.
What is the name for the method used to find objects that are underwater?
Diving for underwater exploration
Why is air pressure at the top of a mountain hard to breathe?
You dont breathe air pressure. You breathe air. It is harder to breathe because of the low air pressure due to the higher elavation.
Does a floating object weigh more when underwater?
Statistically it weighs the same, but it feels less when it is submerged underwater.
Can somebody be made to breathe underwater?
Of course not. Humans are only able to breathe underwater for a few seconds.
Why aren't humans amphibians?
amphibians are creatures that can live in water or on land, that does not mean that if we build a dome underwater and live their that we are amphibians.Amphibians can breathe underwater and on land, and since humans can't breathe underwater without the help of special equipment we are not amphibians.
Can mice breathe under water?
No. If you have a mouse do not put it underwater or you will drown it. Mice breathe with their lungs just like humans.
How to breathe underwater in Minecraft?
you can't breathe underwater
Can a human breathe under water for 20 minutes?
No, humans need air in their lungs to breathe, a situation rarely found underwater.
Can girls turn in to mermaids?
Afraid not...Mermaids dont exist and humans cant breathe underwater.
How do you breathe under water without gear?
Humans cannot breathe underwater unaided. It is impossible as we don't have gills. We have to use scuba equipment.
Why can a giant squid inhabit some of the deepest regions of the sea if humans can't?
They can survive the underwater pressure. Also, they can breathe underwater, and breathing is one of those things that helps keep humans alive.
Can the Arctic fox breathe underwater?
No, the arctic fox cannot breathe underwater.
Can you breathe underwater in Utah?
Without proper equipment no human can breathe underwater anywhere.
Why does fish have to live in water?
They don't have lungs, they have gills. In simple terms, they don't have the right 'equipment' to breathe on land. Just like humans can't breathe underwater.
How do crocodiles breath on land?
They don't, any aquatic reptile needs to return to the surface to breathe after a while, the only creatures that can breather underwater are fish (and all their variants ie: sharks, stingrays etc)
