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97
2. Fuel cell vehicle
2
Fuel cell system
MIRAI_OM_USA_OM62054U(18MY)_O
M62048U(19MY)
■ Hydrogen Gas Characteristics
● Hydrogen gas ignites more easily than gasoline. However, it is lighter than
air and disperses quickly. So even if hydrogen were to leak from the system,
it would quickly dilute until it is no longer flammable.
● As with gasoline and natural gas, hydrogen gas is not dangerous if it is han-
dled properly. Thoroughly read and understand the characteristics shown in
the table below.
Hydrogen gas
LPG
(Liquid Petroleum
Gas)
Gasoline
Normal state
Gaseous
(Lighter than air)
Gaseous
(Heavier than air)
Volatile liquid
(evaporates
easily)
(Heavier than air)
Ease of
ignition
Easier than
gasoline
At the same level
as gasoline
—
Ease of
accumulation
• Disperses
upward and is
diluted to safe
concentrations
in open air
• Does not
adhere to
clothing
• Spreads on the
ground or floor
• Does not
adhere to
clothing
• Spreads on the
ground or floor
• Adheres to
clothing
Detectability
• Due to its
colorless and
odorless state,
difficult to detect
by sight or smell
• Vehicle
hydrogen
detectors will
display a
warning on the
multi-
information
display
• Detectable by
odor and gas
leaking noise
• Detectable by
color and odor
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