How many litres of gas?

[newtoweld]

Hi, I've found two local argon/co2 suppliers..
The first will sell me a 9 litre bottle at 50 bar for £30..
The second a 2 litre bottle at 230 bar for £19.20..

Which bottle gives me the most litres of gas?

(Sorry for the newby/silly question and thanks for any help in advance)

 

[Luke]

bottle volume multiplied by fill pressure

9 x 50 = 450 litres, or 6.7p per litre
2 x 230 = 460 litres, or 4.2p per litre

 

[newtoweld]

Many Thanks

Thanks again.. I read an old post explaining how to work it out but just wanted to be sure.

 

[Shox Dr]

Just bare in mind, neither will last more than 45 mins welding time. It sounds alot, but it isn't

 

[newtoweld]

45 minutes.

At the moment that's a lifetime for me as I'm brand new to this and I'm only tacking scrap together.(With gasless wire). My fingers not on the trigger for more than a few seconds.. I can always upgrade to a bigger bottle as I get better and it beats paying for huge rental/deposit costs - easy to store as well.