how aperson can float in water?how?howlong?i have heard about it.can i do it by getting practise?

Question

plz answer me related to density?physics.

Answer 1

People have lungs. Lungs are filled with air. This is what controls if you sink or stay on the surface.

Density of the human body (without air in the lungs) is pretty close to that of water. So a dead peson will folat forever or till the body is decomposed.

So as long as the live person can manage to hold the air in the lungs, he/she should be OK in the water.

Many deaths in water occur due to loss of body temperature. Once the person is too cold for too long, he/she no longer can struggle for the air, feels like nothing matters anymore, inhales some water and sinks. (Saw the "Titanic"? That water was too cold.)

I hope I didn't creep you out. This is just for the information purposes.

Answer 2

accordind to the law of flotation
If a person is in a state of floatation he displaces equal volume of wter to his weight
in this case we have W=w
where W=weight and w=volume of water diplaced
now,
density of water is 1000 kgm^-3
so in order to float either of the 2 conditiond would be put into practise
1. our density ie mass*volume should be 1000 units
2. our density should be less than it
dead bodies always float but with their heads dowm baause cerebrum is very heavy
though if ve lie down in water facing towards the sky we can float easily by just balancing our falling to right or left as water is exerting pressure in all directions

and then the results r wid u

Besties

Answer 3

Well, what a good question being an animal welfare technician and vet nurse, I have already emailed yahoo to ask them if they would make me a point of contact for cruely treated or absued animals, I will travel and have the knowledge to deal with most of the nasty things that happen in this dreadful world I even said all would be confidentiol, but guess what I have not heard a dicky bird from them. I am very dissapointed that I have not heard from them but I will still help anyone that has questions or worries, and I am sure others on this site would help us too.What do you think? with all good wishes A

Answer 4

As a Naval flight student, I spent a lot of time and energy learning how to float in water. Two things are important, remain calm and you will likely float because the overwhelming majority of people are natural floaters. Floating is far more likely in salt water than in fresh water.

You cannot float forever, as one answerer put it. Eventually, you will become debilitated, exhausted, and, possibly, hypothermic. At which time, you will pass out and eventually drown, or simply freeze to death.

For the vast majority of floaters, to stay afloat for long times, simply relax, put your head back in the water as far as it will go with your nose out of the water, let your legs dangle downward in the water, and float. If you panic or tense up, you will likely sink; so staying calm and relaxed is the key.

For the one percent or so of mankind that are natural sinkers, do the same thing. But you will have to scull now and then with your hands to stay afloat. Sculling is moving your hands under water in a figure eight motion. Even if you are a sinker, sinking will be slow enough that you can take a short break from sculling now and then to rest your arms. So even sinkers can stay afoat for a very long time.

Of course, one can always make floatation gear out of the clothes being worn in the water. In flight training, we took off our trousers while in the water, tied off the pants legs, and wooshed the trousers over our heads to collect air in the pants. Then we simply rested on the pants as floatation devices.

Answer 5

A person can float in water because the human body is lighter than water. With practice a person could float on their back as long as they could take staying in the water.

Practice makes perfect.

Answer 6

A Person can float in water b'coz the density of our body is less than the density of water.
yes, u can do it by practise of 2 or 3 days, if u r a good learner.

Answer 7

Yes, related to the density of the water. practice by lying on your back, so your body weight is evenly distributed. My ex tried to get me to do this but I was too scared for ages because I can't swim. once I tried it I found it was easy. The water will always hold you up so long as you don't start panicking and thrashing around. x

Answer 8

A person can float in water forever as long as the person is full of liquid.

Answer 9

person can float forever - body density is less that water density.

keeping your mouth above water is a whole different question though.

Answer 10

Same as a boat made of steel..The human body must displace more water by weight than it occupies..Study displacement in physics..