Question

heat transfer
using words from the word - box below, complete the paragraph about heat transfer.
list of words: matter, hot, less, solid, fluid, conduction, more, convection, energy, emit, warmer, matter, transfer, absorbs, temperature, radiation, contact, cold, vibrate, writes
all blank has heat. heat is a form of blank caused by particles in an object that blank. the blank the particles of an object vibrate, the blank the object will be. because particles of an object are always moving, heat blank is always happening. heat always flows in the same direction: from blank to blank. heat transfer will stop once two objects reach the same blank. this is known as equilibrium.
there are three key ways that heat transfers. with blank objects, heat transfers when the objects come into direct blank with other things. this is known as blank. liquids and gases are different. because these two states of matter flow or are blank, heat transfer happens when warmer blank rises (particles move) and cooler blank sinks (particles sink). this ongoing process is known as a blank current. heat can also be transferred through space (distance) in the form of blank. this process is known as blank. all objects give off, or blank, some heat. all objects also take in, or blank, heat.
identify the method of heat transfer that takes place in each illustration. write the method of heat transfer underneath the picture.
in each of the following situations, identify the method of heat transfer taking place. write conduction, convection, or radiation on the line next to the statements. choose the best answer.

1. you are stirring a bowl of hot soup with a metal spoon. the spoon starts to feel warmer because of blank.
2. 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 blank.
3. you are doing your homework at a desk that is underneath a lamp. you start to feel hotter because of blank.

Explanation:

Heat is a form of energy. In solids, heat transfer by conduction occurs when objects are in contact. In fluids (liquids and gases), convection involves the movement of warmer and cooler parts. Radiation is heat transfer through space in the form of electromagnetic waves. For the microwave, it's radiation; holding a hot cup is conduction; a lava - lamp shows convection; sitting near a fire is radiation; and heating a spoon in soup is conduction.

Answer:

All matter has heat. Heat is a form of energy caused by motion in an object that vibrates. The faster the particles of an object vibrate, the warmer the object will be. Because particles of an object are always moving, heat transfer is always happening. Heat always flows in the same direction from hot to cold. Heat transfer will stop once two objects reach the same temperature. This is known as equilibrium.
There are three key ways that heat transfers. With solid objects, heat transfers when the objects come into direct contact with other things. This is known as conduction. Liquids and gases are different. Because these two states of matter flow or move, heat transfer happens when warmer fluid rises and cooler fluid sinks. This ongoing process is known as a convection current. 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.

1. Radiation (Microwave uses electromagnetic waves to heat food)
2. Conduction (Holding a hot object, heat transfers through contact)
3. Conduction (Heating a pan on a stove, heat transfers through the pan)
4. Conduction (Holding a hot cup, heat transfers through contact)
5. Radiation (Sitting near a fire, heat reaches you through radiation)
6. Convection (Air circulation in a room, like in a heater - cooler setup)

Situations:

1. Conduction (Metal spoon in hot soup, heat transfers through the spoon by contact)
2. Convection (Lava - lamp, liquid movement due to temperature differences)
3. Radiation (Sitting under a lamp, heat comes from the lamp through radiation)