Explain the proximate analysis of coal in detail.

The proximate analysis of coal is a standardized method used to determine its basic composition and properties. It provides a quick assessment of the coal’s quality and usability for different applications, particularly in power generation, industrial heating, and metallurgy. The analysis focuses on four main parameters: moisture content, volatile matter, ash content, and fixed carbon. Each of these components plays a critical role in determining the efficiency and suitability of coal as an energy resource.  

### 1. Moisture Content  
Moisture in coal exists in different forms: surface moisture, inherent moisture, and combined moisture. The total moisture content affects the combustion efficiency, as higher moisture reduces the calorific value of coal. Moisture content is determined by heating a sample at 105–110°C in an oven until a constant weight is achieved. The ___ _________ _____ _________ _________ _______ _______ _________ _______ __________ _________ _____.
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