Gas Or Vapor Molecular Weight And Gravity Chart
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1
2Carbon Monoxide vs. Air
Where to Install a Carbon monoxide Alarm?
Molecular
Specific
Gas or Vapor
Weight
Gravity
Air has a molecular weight of
Air has a molecular weight of
26.040
Acetylene, C
H
0.900
28.966. Gases with molecular
28.966. Gases with molecular
2
2
Air
28.966
1.000
weights less than 28.966 are lighter
weights less than 28.966 are lighter
Ammonia
17.020
0.590
than air. Gases with a weight
than air. Gases with a weight
higher than 28.866 are heavier
higher than 28.866 are heavier
Argon, Ar
39.948
1.380
than air. Air is made up of 78%
than air. Air is made up of 78%
Benzene
78.110
2.696
Nitrogen and 21% Oxygen -
Nitrogen and 21% Oxygen -
Butadiene
54.090
1.870
Nitrogen has a weight of 28.013
Nitrogen has a weight of 28.013
58.120
Butane, C
H
2.006
4
10
while Carbon Monoxide (CO) has a
while Carbon Monoxide (CO) has a
44.010
Carbon Dioxide, CO
1.519
2
weight of 28.011. CO mixes with
weight of 28.011. CO mixes with
Carbon Monoxide, CO
28.011
0.967
Air as their weights are
Air as their weights are
Chlorine
70.906
2.486
approximately the same.
approximately the same.
Deuterium
2.014
0.070
30.070
Ethane, C
H
1.038
2
6
Ethyl Chloride
64.515
2.230
The National Fire Protection
The National Fire Protection
28.054
Ethylene, C
H
0.968
Association Standard -
Association Standard -
2
4
Fluorine
37.996
1.310
NFPA 720-2009 states “A.9.4.1.2
NFPA 720-2009 states “A.9.4.1.2
The location for effective
The location for effective
Helium, He
4.020
0.138
performance is not generally
performance is not generally
Hexane
86.170
2.973
dependent on mounting height.
dependent on mounting height.
Hydrogen Chloride
36.461
0.070
The density of carbon monoxide is
The density of carbon monoxide is
Hydrogen Sulfide
34.076
1.268
similar to that of air at room
similar to that of air at room
2.016
2.016
Hydrogen, H
Hydrogen, H
1.176
1.176
2
temperature, and carbon
temperature, and carbon
Isobutene
56.108
1.940
monoxide generally mixes readily
Krypton
83.800
2.890
with air.”
16.044
Methane, CH
0.554
4
Methyl Chloride
50.488
1.740
Underwriters Laboratories,
Natural Gas
19.000
0.650
UL 2034 - Standard for Single and
Neon, Ne
20.179
Multiple Station Carbon
0.697
Monoxide Alarms - does not
30.006
Nitric Oxide, NO
1.037
2
include any requirements or tests
28.013
Nitrogen, N
0.972
2
for CO alarms installed at specific
Nitrous Oxide
44.012
1.530
heights.
Octane
114.220
3.944
31.999
Oxygen, O
1.104
2
Answer: CO alarms can be
Ozone
47.998
1.660
installed at any height. All
Pentane
72.150
2.487
major manufacturers of
44.097
Propane, C
H
1.522
3
8
CO alarms installed in
Propylene
42.080
1.452
homes have direct plug in
Sulfur Dioxide
64.060
2.264
Toluene
92.130
3.108
the outlet models.
18.020
Water Vapor - Steam, H
O
0.622
2
Xenon
131.300
4.530
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