The Core Principle of calorimeter Measuring the Calorific Value of Cotton Thread

The calorimeter is a professional instrument for accurately measuring the calorific value of substances. As a common combustible, the calorific value of cotton thread is determined by oxygen bomb calorimetry. The core logic is to put the quantitative cotton thread in the oxygen bomb to fully burn, and the released heat is absorbed by the fixed amount of water in the instrument. Through the change of water temperature and the parameters of the instrument, the calorific value of cotton thread is calculated. The whole process is realized by the law of conservation of energy.

Key Practical Steps in Determination of Calorific Value of Cotton Thread

1. Pre-preparation: first take dry, uniform cotton thread, accurately weigh 1-2 grams (error does not exceed 0.0002 grams), to avoid moisture affecting the data; at the same time check the sealing of the oxygen bomb to ensure that the oxygenation pressure is up to standard to prevent insufficient combustion.

2. Instrument calibration and loading: Inject quantitative distilled water into the inner cylinder of the calorimeter to calibrate the instrument reference parameters; fix the cotton thread on the oxygen bomb electrode, connect the ignition wire to ensure good contact, and then fill it with sufficient oxygen.

3. Ignition and data recording: Start the calorimeter ignition program. After the cotton thread is completely burned, the instrument automatically records the water temperature change. Combined with the water volume of the inner cylinder and the heat capacity of the instrument, the calorific value of the cotton thread can be calculated.

Core Considerations for the Determination Process

- Environmental control: It needs to be operated in a constant temperature laboratory, and the ambient temperature fluctuation does not exceed 1 ° C to avoid external heat interference and ensure accurate data.

- Sample processing: The cotton thread needs to be dried in advance to remove moisture, otherwise the evaporation of water and heat absorption will lead to low calorific value measurement results.

Instrument maintenance: After each measurement, clean the oxygen bomb, check the sealing ring and electrodes to ensure stable performance of the instrument and avoid affecting the measurement accuracy due to aging of components.

By grasping these key points, the calorimeter can quickly and accurately determine the calorific value of cotton thread, providing reliable data support for relevant experiments and applications.