Question

heat transfer
questions

1. what is the difference between heat and thermal energy?

1. in which direction does heat always flow?

1. what does \thermal equilibrium\ mean?

1. why do railroad tracks have small gaps between sections?

1. how does a thermometer work?

1. why do you think metal spoons are not recommended for cooking with non - stick pans?

1. how is radiation different from conduction?

1. if you place a cold can of soda and a room - temperature can of soda on the table, what will happen to their temperatures over time? how could you test this?

1. how does convection help heat an entire pot of soup?

1. when you feel the suns warmth on your face, which type of heat transfer are you experiencing?

Explanation:

Answer:

1. Thermal energy is the total internal energy of a system, while heat is the transfer of that energy between systems due to a temperature difference.
2. Heat always flows from a region of higher temperature to a region of lower temperature.
3. Thermal equilibrium is the state in which two or more objects in physical contact reach the same temperature and no net heat transfer occurs between them.
4. Gaps allow for thermal expansion of the metal in hot weather, preventing the tracks from buckling or warping.
5. A thermometer works through thermal expansion; as the temperature increases, the liquid inside expands and rises up a calibrated scale.
6. Metal spoons can scratch and damage the delicate non-stick coating (like Teflon) on the pan's surface.
7. Radiation transfers energy through electromagnetic waves without requiring a medium, whereas conduction requires direct physical contact between particles.
8. The cold can't temperature will rise and the room-temperature can't will stay the same or slightly decrease until both reach room temperature; you can test this using two thermometers.
9. Convection creates currents where heated, less dense soup rises and cooler, denser soup sinks, circulating heat throughout the pot.
10. Radiation.