In the manufacture of banaspati (or banaspati) ghee, hydrogen gas (H2) is used in a process called hydrogenation. Hydrogen gas is bubbled through liquid vegetable oils in the presence of a nickel catalyst under high pressure, converting the unsaturated fatty acids in the oil into saturated fatty acids, which results in a solid or semi-solid product that is banaspati ghee.
In the manufacture of banaspati ghee, the gas used is _____?
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