Practice is an example of objective materiality**Title: Examples of the Objective Materiality of Practice**
In our daily life and scientific research, there are numerous examples demonstrating the objective materiality of practice.
**I. Construction Projects**
Take the construction of a building as an example. Firstly, the construction workers, who are the main body of practice, are real, tangible human beings with physical strength and construction skills. They are objective entities. Secondly, the materials used for construction, such as cement, steel bars, and bricks, are all objective substances. These materials have their own physical and chemical properties, and they exist independently of human will. For instance, the hardness and durability of steel bars are determined by their material composition. Finally, the construction tools like cranes and excavators are also objective objects. The operation of these tools follows the laws of physics. The crane can lift heavy objects based on the principle of leverage and mechanical force. All these elements in the construction project show that practice has objective materiality.
**II. Agricultural Production**
In agricultural activities, farmers are the practitioners. Farmers are real individuals with their own physical and mental states. The land, which is the object of agricultural practice, is an objective natural resource. It has its own soil quality, topography, and climate characteristics. Different types of soil are suitable for different crops, which is an objective fact. For example, fertile soil is more conducive to the growth of wheat and rice. The seeds used in farming are also objective substances. They have genetic characteristics that determine the growth potential and yield of crops. And the farming tools, such as plows and harvesters, are objective entities designed according to mechanical principles. The whole process of agricultural production from sowing to harvesting reflects the objective materiality of practice.
**III. Scientific Experiments**
Scientists conducting experiments also illustrate this. In a chemical experiment, the chemist (the subject of practice) uses various chemical reagents (objective substances). These reagents have specific molecular structures and chemical properties. For example, hydrochloric acid has the property of acidity, which can react with certain metals. The experimental equipment, such as test tubes, beakers, and spectrometers, are objective objects made according to scientific principles. The reaction process in the experiment is also objective. It follows the laws of chemical reactions, such as the law of conservation of mass. These all prove that practice in scientific experiments has objective materiality.
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