Final answer:
Wooden spoons are preferable for stirring hot liquids because wood is a poor heat conductor compared to metal, which is a good conductor. A wooden spoon stays cooler and is safer to handle during cooking.
Step-by-step explanation:
It is better to use a wooden spoon instead of a metal spoon when stirring soup on the stove because wood does not conduct heat as well as metal does. Metal is a good conductor of heat, which means it allows heat to pass through it quickly, whereas wood is a poor conductor or an insulator and doesn't allow the heat to transfer as easily. Therefore, when you use a metal spoon, it will get hot quickly, making it uncomfortable or unsafe to hold onto without a potholder or glove. On the other hand, a wooden spoon will remain relatively cool to the touch, making it more comfortable and safer for cooking.