Which of the following is a common use for LP gas (liquid propane, C3H8)?

LP gas, or liquid propane, is commonly used as fuel for gas grills. This is because propane burns cleanly and efficiently, producing a consistent heat that is ideal for cooking food. It ignites easily and can be readily controlled, making it a popular choice for grilling where precise temperature regulation is important.

In addition to its use in gas grills, propane is also used in various heating applications, outdoor heating, and as a fuel source for some vehicles. Its accessibility and performance make it a practical choice for both residential and commercial cooking.

In contrast, the other options relate to uses that are not typically associated with propane. Construction materials manufacturing usually relies more on other forms of energy or chemicals. While propane can be involved indirectly in heating processes during plastic production, it is not a primary feedstock for creating plastics. Similarly, while some batteries may use propane in their production process, it is not a common power source for battery technologies themselves. Thus, using LP gas for gas grills is the most straightforward and widespread application among the choices provided.