Things you always wanted to know the answer to.

[DrTre]

If the railway carriage were pressurised to 3-4 bar and the doors opened then yes. The post you quoted talked of pressure change.

[soda]

Why is a porno known as a blue movie?

[DrTre]

Further to that train carriage thing...wouldn't be an issue with the doors shutting, right enough....then again it wouldn't drop to zero....oh fk it, it's all hypothetical anyway, they're not pressurised to 3-4 bar, that'd be stupid.

[kieranjholland]

Pints said:

kieranjholland said:

how do you know if she's faking?

If you know what you're doing, she won't need to.

[Alfanatic]

DrTre said:

AdeTuono said:

Why would 3-4 bar kill you? It's no pressure at all.

You'd almost certainly get bent

Not sure if I'm being silly here, but 3 - 4 bar is three to four atmospheres, isn't it? That's like going between 20 - 30 metres deep in water, which I believe is deep enough to cause the bends if you're under for long enough, which would be about 60 minutes I think, probably a lot longer than you're going to find yourself stuck in a tube train with the doors shut. I know the bends is caused by rising too quickly, but in this case we're talking about opening the doors to a carriage and close to instantly changing the pressure by 3 bar, so it would be like riding a rocket to the surface. Except less fun.

Also, 0 bar would be a vacuum, so it would have to be measuring relative pressure anyway, or just be wrong, if it was measuring internal air pressure. EDIT: Which I know it isn't because of previous answers, so I accept that all this is moot anyway.

[Life Saab Itch]

How long could one stay underwater at depth (enough to get the bends) for, if replacement scuba tanks were brought down to you?

Could you swap a tank per hour (or however long it would take to run out) and stay down indefinitely (or until you were hungry)?

Or is there a limit that the body won't stand being under for more than X amount of time?

[goldblum]

Life Saab Itch said:

How long could one stay underwater at depth (enough to get the bends) for, if replacement scuba tanks were brought down to you?

Could you swap a tank per hour (or however long it would take to run out) and stay down indefinitely (or until you were hungry)?

Or is there a limit that the body won't stand being under for more than X amount of time?

It's not only the depth and the effect that has (partial pressure) on the gas you're breathing,(Nitrogen Narcosis and Hyperoxia)but also how long you want to spend decompressing.

The deeper a diver goes the quicker their air is used and the longer it takes for the nitrogen that's been absorbed by the body to leave the blood and tissue when ascending.If you don't do this slowly and follow

correct guidelines the remaining nitrogen 'bubbles' and can lead to decompression sickness. A typical dive profile nowadays for scuba diving would be 30m for

60mins.However 'technical' divers are the guys who stay down longest and do this by mixing gases.They can't stay down indefinitely because they risk poisoning

by the gases they are breathing.So in short a diver's time at depth is limited mostly by the effect of the gas he breathes on his body and the length of time it takes to get rid of that gas.

[AdeTuono]

Alfanatic said:

DrTre said:

AdeTuono said:

Why would 3-4 bar kill you? It's no pressure at all.

You'd almost certainly get bent

Not sure if I'm being silly here, but 3 - 4 bar is three to four atmospheres, isn't it? That's like going between 20 - 30 metres deep in water, which I believe is deep enough to cause the bends if you're under for long enough, which would be about 60 minutes I think, probably a lot longer than you're going to find yourself stuck in a tube train with the doors shut. I know the bends is caused by rising too quickly, but in this case we're talking about opening the doors to a carriage and close to instantly changing the pressure by 3 bar, so it would be like riding a rocket to the surface. Except less fun.

Also, 0 bar would be a vacuum, so it would have to be measuring relative pressure anyway, or just be wrong, if it was measuring internal air pressure. EDIT: Which I know it isn't because of previous answers, so I accept that all this is moot anyway.

Glad you've cleared that up

[Life Saab Itch]

goldblum said:

It's not only the depth and the effect that has (partial pressure) on the gas you're breathing,(Nitrogen Narcosis and Hyperoxia)but also how long you want to spend decompressing.

The deeper a diver goes the quicker their air is used and the longer it takes for the nitrogen that's been absorbed by the body to leave the blood and tissue when ascending.If you don't do this slowly and follow

correct guidelines the remaining nitrogen 'bubbles' and can lead to decompression sickness. A typical dive profile nowadays for scuba diving would be 30m for

60mins.However 'technical' divers are the guys who stay down longest and do this by mixing gases.They can't stay down indefinitely because they risk poisoning

by the gases they are breathing.So in short a diver's time at depth is limited mostly by the effect of the gas he breathes on his body and the length of time it takes to get rid of that gas.

Thank you.

[DrTre]

AdeTuono said:

Alfanatic said:

DrTre said:

AdeTuono said:

Why would 3-4 bar kill you? It's no pressure at all.

You'd almost certainly get bent

Not sure if I'm being silly here, but 3 - 4 bar is three to four atmospheres, isn't it? That's like going between 20 - 30 metres deep in water, which I believe is deep enough to cause the bends if you're under for long enough, which would be about 60 minutes I think, probably a lot longer than you're going to find yourself stuck in a tube train with the doors shut. I know the bends is caused by rising too quickly, but in this case we're talking about opening the doors to a carriage and close to instantly changing the pressure by 3 bar, so it would be like riding a rocket to the surface. Except less fun.

Also, 0 bar would be a vacuum, so it would have to be measuring relative pressure anyway, or just be wrong, if it was measuring internal air pressure. EDIT: Which I know it isn't because of previous answers, so I accept that all this is moot anyway.

Glad you've cleared that up

Point of order though, it's not 60mins and it's not 30m. Bends can and do occur at substantially less depth and less time under than those figures, it's the rapid depressurisation that is the main factor.

ETA But anyways, yep it's all moot. Choo choo! Doors closing.

Edited by DrTre on Sunday 19th February 18:41

[Ayahuasca]

What happens if you are 'airside' an an airport - past security, immigration, etc and mingling with passengers who have just arrived from abroad who are yet to pass customs and immigration, if there is a fire?

Is everyone evacuated into a secure 'airside' muster area or will some immigrants be able to enter the country with no checks?

[TheEnd]

Dixie68 said:

TheEnd said:

Coffee, white, none is a Juile Andrews...

Black, none is a Whoopie Goldberg (sp?)

Yep, I forget what black with sugar is.

[Blakeatron]

Is there a robot who sticks on all the letters to backs of new cars?

Did they really spend millions building/buying a robot to attach stickers or is someone employed to do it?

[JonnyFive]

Blakeatron said:

Is there a robot who sticks on all the letters to backs of new cars?

Did they really spend millions building/buying a robot to attach stickers or is someone employed to do it?

Some are already on from the factory, some are put on at PDI.

Thats why sometimes you'll see a 'Sport' badge or the like stuck on real dodgy, the chap doing the PDI either had his own template of where to put it, or just couldn't be bothered to do it properly.

[aclivity]

goldblum said:

However 'technical' divers are the guys who stay down longest and do this by mixing gases.They can't stay down indefinitely because they risk poisoning

by the gases they are breathing.So in short a diver's time at depth is limited mostly by the effect of the gas he breathes on his body and the length of time it takes to get rid of that gas.

Saturation divers are the guys who stay down the longest, the record being 31 days to return from 685m.

[AstonZagato]

TheEnd said:

Dixie68 said:

TheEnd said:

Coffee, white, none is a Juile Andrews...

Black, none is a Whoopie Goldberg (sp?)

Yep, I forget what black with sugar is.

White with a spoonful of sugar is a Mary Poppins
White with one lump is an Adolf
White with one is also a Heather Mills

[OlberJ]

TheEnd said:

Yep, I forget what black with sugar is.

Don't know but it should be a Whitney now

[goldblum]

aclivity said:

goldblum said:

However 'technical' divers are the guys who stay down longest and do this by mixing gases.They can't stay down indefinitely because they risk poisoning

by the gases they are breathing.So in short a diver's time at depth is limited mostly by the effect of the gas he breathes on his body and the length of time it takes to get rid of that gas.

Saturation divers are the guys who stay down the longest, the record being 31 days to return from 685m.

Nice find. 31 days? J.C. on a stick!

Diving on mixed gases (Trimix in this case) is classed as technical diving. http://en.wikipedia.org/wiki/Trimix_(breathing_gas...

[Dixie68]

TheEnd said:

Yep, I forget what black with sugar is.

According to the younger members of the last squadron I served on, black with sugar was a 'Beyonce' as it was black & sweet. Personally if I'd ever wanted a coffee, black, with sugar I'd have asked for a coffee, black, with sugar - although mine was always either a NATO standard or a Julie Andrews

[Shaolin]

DrTre said:

AdeTuono said:

You'd almost certainly get bent

In a railway carriage?

I've seen some people coming mincing out of them so it does happen.