presence of excess carbonaceous matter in the clay
presence of gas forming material in the clay
bad or rapid burning
all the above
Discuss in Comment
➠ CivilBoss ➠
"Scientists dream about doing great things. Engineers do them."
PSC Advertisement ⏩ | Federal PSC | Bagmati PSC | PSC Karnali | PSC Lumbini | PSC Sudurpaschim | PSC Gandaki | PSC State 1.