章 687: Chapter 684: Eternal Night Approaches

Combustion!!!

The audience's eyes widened in unison as they let out cries of surprise.

Can soil also burn?

"Of course, and the combustion effect is very good. You can simply think of it as charcoal-like soil; it has other names, such as peat and lignite, which is coal with the lowest degree of coalification."

This comparison made the audience instantaneously understand the combustion ability of peat soil.

So it's coal!

Sparks ignited on the charcoal he held, and Bi Fang blew deliberately into it. Soon, a small flame sprinted up on the tinder, and seeing this, he didn't hurry to insert the peat but instead grabbed a handful of loose peat soil.

"When the organic matter content in clay exceeds 10% but is less than 60%, it is called peaty soil, and only when it surpasses 60% can it become peat. This kind of soil mostly has a calorific value of 9.50 to 15.0 megajoules per kilogram and burns very easily."