Heating and cooling
Created by marvelousbluecookie
If you have a tiny metal pin at 90°C and a big bucket of water at 40°C, which one contains more heat energy -and why?
big bucket because it has more particles
| Term | Definition |
|---|---|
If you have a tiny metal pin at 90°C and a big bucket of water at 40°C, which one contains more heat energy -and why? | big bucket because it has more particles |
If you have two cups of water - one small and one large -and they start at the same temperature, which one will cool down faster? | The small one cause it has less thermal energy stored |
If you had two hot potatoes - one small, one large -which one would stay warm longer, and what’s the main reason? | The large one because it's surface area is less than it's volume so heat escapes more quickly |
Do particles move from the hot end of a solid to the cold end — or do they stay in place? | They stay in place |
what travels from the hot end to the cold end during conduction? | Energy |
Which type of heat transfer works even in space where there are no particles? | Radiation |
If you heat one end of a metal spoon and one end of a wooden spoon, which one gets hot faster — and what’s the reason? | The metal spoon cause it has free electrons which allow energy to move through quicker |
Why does warm fluid rise? | Because it is less dense |
Why can’t convection happen in solids? | Because in convection particles need to move around |
If you heat the bottom of a pan of water, which part of the water moves upward first — the water at the bottom or the water at the top? | The bottom |
Does IR radiation need particles to travel, or can it travel through a vacuum? | Vaccum |
Does a cold object emit no IR radiation, or just less IR radiation? | Less |
Which surface would cool down fastest: a black matte can or a shiny silver can? | Black matte can |
Why does adding more layers of insulation keep something warm for longer? | It traps air and air is a poor conductor. Less conduction causes more insulation |
If you had two coats — one with one thick layer and one with three thin layers — which one would keep you warmer, and why? | Three thin layers because it traps air between the layers |
If you wanted to design the best possible insulation, which two things would you focus on?
Choose the two that matter most:
A) Trapping lots of air
B) Using shiny surfaces
C) Making the insulation very heavy
D) Adding multiple layers | A and D |