The standardized NYMEX natural gas futures contract is for delivery of 10,000 mmBtu (10,000 million Btu) of energy (approximately 10,000,000 cubic feet (280,000 m3) of gas) at Henry Hub in Louisiana over a given delivery month consisting of a varying amount of days. As a coarse approximation, 1000 ft3 of natural gas ≈ 1 MMBtu ≈ 1 GJ. Monthly contracts expire 3–5 days in advance of the first day of the delivery month, at which points traders may either settle their positions financially with other traders in the market (if they have not done so already) or choose to "go physical" and accept delivery of physical natural gas (which is actually quite rare in the financial market).
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