Question

Почему первое начало термодинамики можно назвать законом сохране-ния и превращения энергии?

Answer 1

Ответ:

Первый закон термодинамики показывает нам куда энергия полученная объектом извне девается телов. Теплота полученная телов идет на совершение работы телом (или над ним) и на изменение его внутренней энергии.

Следовательно первый закон термы нам показывает, что энергия никуда не исчезает (=>является законом сохранения энергии) и переходит в другой вид энергии(=>закон превращения энергии)

Answer 2

The First Law of Thermodynamics: Conservation and Conversion of Energy

The First Law of Thermodynamics, also known as the Law of Conservation and Conversion of Energy, states that energy cannot be created or destroyed in an isolated system. Instead, it can only be converted from one form to another or transferred between different parts of the system. This law is a fundamental principle in the field of thermodynamics and has wide-ranging applications in various scientific and engineering disciplines.

The First Law of Thermodynamics can be summarized as follows:

1. Energy is conserved: The total energy of an isolated system remains constant over time. It means that the total amount of energy in a closed system, such as the universe, remains constant.

2. Energy can be converted: Energy can be converted from one form to another. For example, mechanical energy can be converted into thermal energy, electrical energy, or chemical energy, and vice versa.

3. Energy transfer: Energy can be transferred between different parts of a system or between different systems. This transfer can occur through various mechanisms, such as heat transfer, work done by external forces, or mass flow.

Explanation and Examples:

The First Law of Thermodynamics is based on the principle of energy conservation, which is a fundamental concept in physics. According to this law, the total energy of a closed system remains constant, regardless of the processes occurring within the system.

For example, consider a simple system consisting of a gas enclosed in a container with a movable piston. If heat is added to the system, the gas molecules gain kinetic energy, causing them to move faster and exert a greater force on the piston. As a result, the piston moves, and work is done by the system. The increase in the internal energy of the gas due to the added heat is equal to the work done by the system.

Conversely, if work is done on the system by compressing the gas, the internal energy of the gas increases, and the temperature rises. This increase in internal energy is equivalent to the work done on the system.

In both cases, the total energy of the system (internal energy + work done) remains constant. This is an example of energy conversion, where heat energy is converted into work or vice versa.

Verification:

The information provided above is based on the general understanding of the First Law of Thermodynamics. The specific snippets from the search results do not provide direct citations for the explanation. However, the explanation aligns with the general knowledge and principles of thermodynamics.

Conclusion:

The First Law of Thermodynamics, also known as the Law of Conservation and Conversion of Energy, states that energy cannot be created or destroyed in an isolated system. Instead, it can only be converted from one form to another or transferred between different parts of the system. This law is a fundamental principle in thermodynamics and has wide-ranging applications in various scientific and engineering disciplines.