Question: how many btu in 1 m3 of natural gas?
Answer: One cubic meter is (3.281)3 cubic feet, or 35.31 ft3, and one cubic foot is (0.3048)3 = 0.02832 m3. The Btu is defined so that under unvarying conditions over time and around the world, 1 cf should yield 1,000 Btu, or 1 MBtu, or heat.