Question

1. of the 3 temperature scales (fahrenheit, celsius, kelvin), which one do we not use in science? fahrenheit
2. which one of those three scales starts at absolute zero (and has no negative numbers)? kevin
3. heat and temperature are easily confused. one of them is the average motion of the particles in something, and the other is the total motion of those particles. which is which?
4. in one sentence, how does a refrigerator work?
5. which device uses a bimetallic strip to turn it off and on? thermostat
6. put these 4 steps of a 4 - stroke car engine in order!

a. fuel is compressed
b. fuel explodes
c. fuel enters the cylinder
d. exhaust is pushed out

Explanation:

1. The Kelvin scale starts at absolute zero (0 K) and has no negative values as it is based on the theoretical point where all molecular motion ceases.
2. Temperature is the average kinetic - energy (average motion) of particles, while heat is the total kinetic energy (total motion) of particles.
3. A refrigerator works by using a compressor to circulate a refrigerant that absorbs heat from the inside and releases it outside.
4. In a 4 - stroke car engine, first fuel enters the cylinder (C), then it is compressed (A), then it explodes (B), and finally exhaust is pushed out (D).

Answer:

1. Kelvin
2. Temperature is the average motion of particles; heat is the total motion of particles.
3. A refrigerator circulates a refrigerant to transfer heat from inside to outside.
4. C, A, B, D