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G6KUI > INFO 23.07.02 16:56l 41 Lines 1401 Bytes #999 (0) @ WW
BID : 24714-G6KUI
Read: DB0FHN GUEST
Subj: Balloons - the real facts
Path: DB0FHN<DB0ZWI<DB0MAB<DB0FBG<DB0HOT<DB0MRW<OK0PKL<OK0PPL<RZ6HXA<SP7MGD<
IK6PYS<ON0AR<GB7FCR<GB7CIP<GB7COV<GB7DBY<GB7DBY
Sent: 020723/1403z @:GB7DBY.#23.GBR.EU NPF2.54c [G6KUI PMS Alvaston Derby]
Hi, We have all been going around in circles without considering the *REAL*
facts of the case.
Let's get back to basics.
Everyone must have learnt at School during basic Chemistry or Physics
lessons that - one gram-molecule of a gas (at N.T.P.) occupies about 22.4
litres. This means that the molacular weight expressed in grams of ANY
real gas occupies 22.4 litres at 0 degC and 760mm Hg pressure.
Let us consider 22.4 litres of various gases.
WEIGHT LIFT in AIR
Oxygen (O2) = 32gms - 3gms
Nitrogen (N2) = 28gms + 1gms
Ammonia (NH3) = 17gms +12gms
Methane (CH4) = 16gms +13gms
Helium (He) = 4gms +25gms
Hydrogen (H2) = 2gms +27gms
Vacuum (--) = 0gms +29gms
This is purely the effect of what is INSIDE the balloon, not the structure
of the balloon.
Therefore if our balloon was 22.4 litres in size and the structure weighed
25 gms ( excluding the gas ) then the balloon would exert a downwards force
( ie it would fall ) in every case except except for Hydrogen or a Vacuum.
If the balloon structure only weighed 5 gms then every gas that I've listed
except Nitrogen and Oxygen would make the balloon rise in air.
All very simple really , even a school-child should be able to work it out.
73, Pete G6KUI
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