Like any other chemical process, combustion releases substances. We will see in further detail what these substances are.
LIGHT
|
Colour of the flame |
Temperature (°C) |
|---|---|
|
Scarlet |
525 |
|
Dark red |
700 |
|
Cherry red |
900 |
|
Dark yellow |
1100 |
|
Light yellow |
1200 |
|
White |
1300 |
|
Bright white |
1500 |
HEAT
Heat is the direct result of the generation of energy during combustion, and it is the main cause for its propagation. Man can stand a maximum temperature of 150°C for less than 5 minutes, but only when the humidity of air is very low. As the humidity of air increases, the limit of tolerable heat for a human being decreases. At an average humidity level, it is possible to tolerate at most 50°C for a hour. We need to consider the fact that, during combustion, a great amount of steam is produced, that increases the humidity of air. Direct consequences of heat on human body are dehydration of tissues, difficulty or inability to breathe and burns. Burns can be first degree (reddened skin, easy and spontaneous recovery), second degree (blisters, medical cures are needed) or third degree (under the dermis, tissue can be charred; hospitalization, and, in some cases, skin graft, is needed).
