[LiamS]

yes I know I'm gluten for punishment :tongue: and i know the top three threads in here have been started by me

but could anyone explain the basics and formula behind boyles law?

or at least recommend a website that would explain it? (wikipidea (sp?) confuses me )


cheers in advanced


liam

 

[Scuba Diva]

Erm . . haven't you just done your physics exam? :star:

 

[LiamS]

Erm . . haven't you just done your physics exam? :star:

i did a gcse level one but that only covers things like voltage, gravity, forces ect boyles is a higher grade

 

[nigelH]

yes I know I'm gluten for punishment :tongue: and i know the top three threads in here have been started by me

but could anyone explain the basics and formula behind boyles law?

You have a quantity of gas.
You have to wait for it to return to the same temperature after you do things becuase we're assuming the temperature doesn't change.

Boyle says: Pressure multiplied by volume is a constant for that quantity of gas.

eg:
Two cylinders with 150 bar in the 12L one and 50 bar in the 10L other.
You connect them together.

150*12 + 50*10 is the sum of the two constants so you started with. ie: 2300 somethings.
It is now in 22L worth of cylinder.
so P*22 = 2300
so P = 104.5 bar

Is that what you wanted?

 

[LiamS]

You have a quantity of gas.
You have to wait for it to return to the same temperature after you do things becuase we're assuming the temperature doesn't change.

Boyle says: Pressure multiplied by volume is a constant for that quantity of gas.

eg:
Two cylinders with 150 bar in the 12L one and 50 bar in the 10L other.
You connect them together.

150*12 + 50*10 is the sum of the two constants so you started with. ie: 2300 somethings.
It is now in 22L worth of cylinder.
so P*22 = 2300
so P = 104.5 bar

Is that what you wanted?

looks about right cheers for that

 

[divechuck04]

I'm feeling generous today, Liam

Try this What is Boyle's Law?

HTH

DC

 

[BSH]

Don't PADI teach this, BSAC do very early on

 

[LiamS]

Don't PADI teach this, BSAC do very early on

padi teach the basics of pressure at ow level... but the science behind it kicks in at divemaster level

 

[Leg Of Salmon]

I can't beliveve this isn't covered in GCSE level physics.

 

[divechuck04]

I can't beliveve this isn't covered in GCSE level physics.

Ditto.

Bring back the good 'ol days (hmmm, maybe not)

DC

 

[jamesp]

I can't beliveve this isn't covered in GCSE level physics.

Having seen a foundation level GCSE science paper, I can.

 

[LiamS]

I can't beliveve this isn't covered in GCSE level physics.

i can

Ditto.

Bring back the good 'ol days (hmmm, maybe not)

DC

Having seen a foundation level GCSE science paper, I can.

agreed... even the higher level gcse physics paper had all the formulae typed all over it, kinda makes you want too say they're getting easier.... but they're not

i cant believe my 1,000th post is spent arguing the case of gcse's, -sigh-

 

[nigelH]

The Feynman Lectures on Physics

everything you wanted to know about everything.

 

[Scuba Diva]

The Feynman Lectures on Physics

everything you wanted to know about everything.

gave a copy of those to my OH - he was v. pleased!

 

[Garspeed]

Boyles Law : P1*V1 = P2*V2

ie double the pressure = half the volume

or to put it another way, use 20 litres a minute on surface then when at 30 meters where pressure is 4 bar you will use 80 litres a minute

 

[DannyB]

The Feynman Lectures on Physics

everything you wanted to know about everything.

Not heard of this before... So I've had a look and now I want it

That's Luke on short rations for a couple of months then!

Danny

 

[hugoboss]

Another case for the Encyclopeadia of recreational diving and the diving knowledge workbook

 

[Gimbo]

Is this something to do with Susan Boyle and the Britain got talent? :tongue:

 

[LiamS]

Is this something to do with Susan Boyle and the Britain got talent? :tongue:

of course not :embarassed:

 

[divechuck04]

Another case for the Encyclopeadia of recreational diving and the diving knowledge workbook

Indeed. Everything you need to know is here...

DC