Final answer:
Heat should never be applied directly to a cylinder, as it can cause damage to the cylinder.
Step-by-step explanation:
The statement 'Heat should never be applied directly to a cylinder' is True.
Directly applying heat to a cylinder can lead to uneven heating and expansion, which can cause the cylinder to warp or crack. It is important to use proper heating techniques, such as using a heat source that is evenly distributed and heating the cylinder indirectly through a heat transfer medium.
For example, when heating a glass cylinder in a lab setting, a Bunsen burner flame is not applied directly to the glass. Instead, a heating mantle or water bath is used to transfer heat to the cylinder indirectly, allowing for more controlled heating and minimizing the risk of damage to the cylinder.