Nitrous oxide
physical risks

At room temperature (20 °C) the saturated vapour pressure is 50.525 bar, rising up to 72.45 bar at 36.4 °C (97.5 °F) —the critical temperature. The pressure curve is thus unusually sensitive to temperature.

As with many strong oxidisers, contamination of parts with fuels have been implicated in rocketry accidents, where small quantities of nitrous/fuel mixtures explode due to " water hammer "-like effects (sometimes called "dieseling"—heating due to adiabatic compression of gases can reach decomposition temperatures). Some common building materials such as stainless steel and aluminium can act as fuels with strong oxidisers such as nitrous oxide, as can contaminants that may ignite due to adiabatic compression.

There also have been incidents where nitrous oxide decomposition in plumbing has led to the explosion of large tanks.
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