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  2. Ammonia - Wikipedia

    en.wikipedia.org/wiki/Ammonia

    0.86 kg/m 3 (1.013 bar at boiling point) ... ≈9 atm. Nitric oxide and nitrogen dioxide are intermediate in this conversion: ... A storage vessel capable of 250 psi ...

  3. Graphene - Wikipedia

    en.wikipedia.org/wiki/Graphene

    The Nobel announcement illustrated this by saying that a 1 square meter graphene hammock would support a 4 kg cat but would weigh only as much as one of the cat's whiskers, at 0.77 mg (about 0.001% of the weight of 1 m 2 of paper). [141] Large-angle bending of graphene monolayers with minimal strain demonstrates its mechanical robustness.