We are constantly dealing with things at different temperatures. Sometimes we want the heat to flow faster (cooking) and sometimes we want to prevent its flow (sleeping bags). In your group, discuss other situations when you would want to alter heat flow. What are three such situations? How does energy flow change over time? Write your thoughts in Notes on your handheld computer.

Sometimes we prefer uniform temperatures (a non-drafty room) and sometimes we prefer contrast (hot syrup on ice cream). Can you think of other times when you want uniform or non-uniform temperatures? Which condition (uniform or non-uniform) is easier to keep for the longest period of time? Describe these situations in Notes on your handheld computer.