Heat Transfer

Using words from the word bank (you need to click the blank to have it pop up), complete the paragraph about heat transfer. There are three key ways that heat transfers. With solid objects, heat transfers when the objects come into direct contact with other things or touch each other. This is known as conduction. Liquids and gases are different. Because these two states of matter flow, or are fluid, heat transfer happens when the less dense particles rise (the hot particles) and the more dense particles sink (the cold particles). This ongoing process is known as convection. Heat can also be transferred through space (distance) in the form of waves. This process is known as radiation. All objects give off, or emit, some heat. All objects also take in, or absorb, heat. Radiation You are doing homework at a desk that is under a lamp. You start to feel hotter because of this type of heat transfer from the lamp. You are in science class and want to see if the hot plates were used recently. You place your hand over the hot plate. Without touching the hot plate, your hand feels warmer. Heat is transferred to your hand by this type of heat transfer. A microwave heating your food. A campfire making your legs warm in your chair 3 feet away. Conduction You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer because of this type of heat transfer. You are roasting marshmallows at a campfire. The metal skewer (stick) that you're cooking your marshmallow on burns your hand because of this type of heat transfer. Your hand warming up when holding your mug of hot chocolate. An egg frying in a frying pan on the stove. Convection You buy a lava lamp from the store. As the lamp heats up, blobs of liquid rise to the top then sink back down to the bottom. This process continues because of this type of heat transfer. Your best friend has a bunk bed. You move from the bottom bunk to the top bunk and notice that the air is warmer. The warm air rises because of this type of heat transfer. The temperature in your basement is much cooler because of this. This type of heat transfer can be seen in boiling water.