Final answer:
The heat produced by the secondary flame of an MPS gas is less than the heat of acetylene, as acetylene can produce flames with significantly higher temperatures.
Step-by-step explanation:
The heat produced by the secondary flame of an MPS (Metal Protection Spray) gas is less than the heat of acetylene. Acetylene is a highly combustible gas used in welding that can produce a flame of up to about 3,330°C (6,020°F) with oxygen,
which is significantly hotter than the flames produced by many other fuel gases. MPS gases are generally used for surface coating processes and provide adequate heat for the purpose but do not reach the high temperatures that acetylene achieves.
The heat produced by the secondary flame of an MPS gas is less than the heat of acetylene. The primary purpose of an MPS gas is to provide a hot,
concentrated flame for applications such as metal cutting, welding, and brazing. Acetylene, on the other hand, provides an even hotter flame and is commonly used for similar processes, as well as in the field of lighting.