Heat Flashcards
1
Q
Sun gives off
A
2x10^17 W
2
Q
1 watt
A
1 J/ sec
3
Q
Earth gives off
A
44x10^12W = 44TW
4
Q
People use
A
ca. 17.7 TW
5
Q
Heat comes from radiactive elements
A
21 +/- TW from radiactive elements
6
Q
Heat comes from cooling of the earth
A
23 +/- TW from cooling of earth
7
Q
at the beginning of earrth
A
radioactive elements gave off 5x as much heat
8
Q
the other 23+/- TW
A
13 TW come from core, coolinng of core and crystallisation of core
9
Q
heat can be moved through
A
conduction, convection, radition, advection
10
Q
conduction
A
hot material means fast atom vibration –> transfers kinetic energy to colder atom
11
Q
convection
A
caused by buoyance, hot material is less dense –> rises
12
Q
radiation
A
electromagentic radiation
in earth unsure / controversial
13
Q
Advection
A
something hot physically moved, ex. by mountain
