One Question per Day in Applied Chemistry (8-4)

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Leveraging knowledge related to applied chemistry, including (analytical chemistry, physical chemistry, principles of chemical engineering, chemical engineering), we are launching the \"One Question per Day\" activity; simply reply to get the answer. To encourage ongoing participation from everyone! Get a 3-wealth reward just for participating! Correct answers earn an additional 5 wealth rewards. I hope everyone will participate actively, learn together, and make progress together! ! ! The minimum thickness of the wall of a steel chimney must meet the requirements of the following formula: When the chimney height is no more than _______ m, tmin = 4.5 + C; when the chimney height is greater than _________ m, tmin = 6 + C. Here, tmin represents the minimum wall thickness in mm, while C is the corrosion thickness allowance – it is set to 2 mm when there is an insulating layer, and to 3 mm when there is no such layer. 20m