Radiative heat transfer uses light, basically. It's how the sun heats us. Then there's conduction - put something hot in contact with something less hot, and heat flow from one to the other. Convection is just a case of conduction, where the one of the things is a fluid that can expand and then rise by gravity, so it carries heat away. Think hot-air balloon, or thunderstorm
Answer:
There are two tension adjustments on the sewing machine the upper and the lower. The upper tension controls the thread from the needle, while the lower tension controls the thread from the bobbin case. These tensions must be adjusted to suit various fabrics.
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