The Kjeldahl apparatus is a laboratory device used for determining the nitrogen content in organic material. This method is commonly employed for the determination of protein content. Essentially, the Kjeldahl method enables the detection and quantitative measurement of nitrogen within an organic sample. The Kjeldahl method is highly sensitive and accurate for determining the total nitrogen content in a sample. Therefore, it is widely used for the determination of protein content in various fields such as the food industry, agriculture, environmental sciences, and many others.