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The Scope of Physics

The Scope of Physics

Physics is concerned with the interactions of energy, matter, space, and time, in order to discover the underlying mechanisms that underpin all phenomena. The word "physics" comes from the Greek word "phúsis", which means nature. Physics seeks to comprehend the natural world around us at its most fundamental level. It emphasizes the use of quantitative laws to do this, which could be valuable in other fields that want to push the performance boundaries of present technologies.
Physics knowledge...

Cyclic Processes And Isolated Systems

Cyclic Processes And Isolated Systems

A thermodynamic system with zero heat exchange and work is an isolated system. For these systems, the internal energy remains constant.
In the case of a non-isolated system, the change in the internal energy is zero only if the process is cyclic. A thermodynamic process is considered cyclic if the system undergoes a series of changes and returns to its initial state.
Consider a cyclic process that returns to its initial state, undergoing a four-step process. The heat transfer along each path...

Conservation of Mechanical Energy

Conservation of Mechanical Energy

The mechanical energy E of a system is the sum of its potential energy U and the kinetic energy K of the objects within it. What happens to this mechanical energy when only conservative forces cause energy transfers within the system—that is, when frictional and drag forces do not act on the objects in the system? Also assume that the system is isolated from its environment; in other words no external force from an object outside the system causes energy changes inside the system.
When a...

Estimation of the Physical Quantities

Estimation of the Physical Quantities

On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...

The Carnot Cycle

The Carnot Cycle

Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
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Isochoric and Isobaric Processes

Isochoric and Isobaric Processes

A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only.
Suppose 1000 g of water is heated from 40 degrees...

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Related Experiment Video

Updated: May 12, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Characterizing scientific production and consumption in physics.

Qian Zhang¹, Nicola Perra, Bruno Gonçalves

¹Laboratory for the Modelling of Biological and Socio-technical Systems, Northeastern University, Boston, MA 02115, USA.

Scientific Reports

|April 11, 2013

Summary

This study maps the evolution of physics knowledge globally over 50 years, identifying key cities driving scientific production and consumption. It reveals temporal and spatial dynamics in physics research worldwide.

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Last Updated: May 12, 2026

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Area of Science:

Physics
Bibliometrics
Urban Studies

Background:

Understanding the geographical distribution and evolution of scientific knowledge is crucial.
Citation networks offer a powerful tool to analyze scientific collaboration and impact.

Purpose of the Study:

To analyze the spatio-temporal dynamics of physics knowledge using citation networks.
To identify key global cities in physics knowledge production and consumption.
To develop algorithms for ranking scientific production.

Main Methods:

Analysis of the American Physical Society's publication database over 50 years.
Generation of geolocalized citation networks at the urban area level.
Development of a knowledge diffusion proxy and scientific production ranking algorithms.

Main Results:

Identification of key cities influencing physics knowledge production and consumption over time.
Characterization of top-ranking cities for scholarly research in physics.
Demonstration of spatio-temporal patterns in physics knowledge diffusion.

Conclusions:

The developed methodology provides insights into the dynamics of physics knowledge.
The approach can be extended for comparative studies across different scientific disciplines.
This research highlights the importance of urban areas in global scientific advancement.