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Classification
Contents of Physics 1: Heat and Light :
Gem fire
( mineral)
Prajñāpanā31 classifies the fire-bodied substances into two classes visible and non-visible. It also has a wider classification detailed earlier. Pujyapāda 32 classified the firebodied substances in one more way. Accordingly, they have four types -- (i) fire, (ii) fire-body, (iii) fire-bodied and (iv) fire-soul. Out of them, only the third variety (and fourth variety also) is said to be living, the rest being hot and non-living. This classification is more basic. All types of fire bodies may be developed or non-developed. The Prajñāpanā classification details indicate that in olden days, light, gem light and electricity all were supposed to be firy substances. In general, heat may be said to be of three types :
(i) Wood fire (Kāṣṭhāgni)
(ii) Frictional fire (Gharṣaṇāgni ) (iii) Interconvertible fire
These can be in four different forms as shown in Table
1 below:
Table 1 Various Forms of Hot Bodies.
(i) Heat forms Ashy fire
( straw etc.)
Fuelless fire
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Lampfire Frictional fire
(ii) Heat/light (iii) Electricity (iv) Light
Flame
Electric light- Sunlight
ening
Starfires
Ulkā
Transform
ational fire Burning coal
303
Electric
sparks
( smokeless)
It is clear that none of the classifications include sun and stars though the canons indicate their hotness and heating capacity of their rays. In fact, the sun and stars have been included among the four types of five-sensed celestial beings which are highly developed ones.
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