165

Relationship between the capacitance of a plate capacitor and thermal capacity

Electrical capacitance C

el

(stated as the unit

⋅

V

sA

) is derived from the relationship

between the chargeQand theapplied voltageU.

Thermal capacity of a flat plate

The thermal capacity C

th

(also known as heat capacity), stated as the unit

K

J

is

derived from the relationship between the heat Q

th

and the temperature difference

∆

T. In

other words, the thermal capacity can be described as the amount of energy stored

uponeach change in temperature.

T

Q C

th

th

∆

∆

=

The heat Q

th

can be described according t

by the specific thermal capacity c

th

,

themassmand the temperature difference

∆

T.

Tmc Q

th

th

∆⋅ ⋅

= ∆

The specific thermal capacity c

th

is expressed as amaterial constant in the unit

⋅

Kkg

J

. I

if

∆

Q

th

is replaced b

the relationship for thermal capacity

C

th

is:

mc C

th

th

⋅

=

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