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Paris braces for record heat as Europe scorched again

Parisians were on Monday bracing for potentially the hottest ever temperature in the French capital this week as a new heatwave blasted into northern Europe that could set records in several countries.

Heat, humidity keeps hold on Eastern US as weekend slogs on

A heat wave will continue to keep much of the Eastern United States in its grip Sunday, while a cold front that could lower temperatures in the middle of the country may be accompanied by thunderstorms that threaten flash ...

US braces for second day of scorching weekend temperatures

Americans braced for a second—and equally scorching—day of dangerously hot weather Sunday, with daytime temperatures forecast to approach 100 degrees Fahrenheit (38 degrees Celsius) across a number of major US cities.

US bracing for extreme heat as weekend temperatures soar

The United States is bracing for a weekend of extremely hot weather, with major cities including New York and Washington expecting temperatures close to or exceeding 100 degrees Fahrenheit (38 degrees Celsius).

Heat wave forecast prompts Chicago public housing checks

Public housing officials in Chicago were planning wellbeing checks on residents as the heat and humidity are expected to mount to dangerous levels as part of a wave of sweltering weather covering a substantial portion of ...

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Temperature

In physics, temperature is a physical property of a system that underlies the common notions of hot and cold; something that feels hotter generally has the higher temperature. Temperature is one of the principal parameters of thermodynamics. If no heat flow occurs between two objects, the objects have the same temperature; otherwise heat flows from the hotter object to the colder object. This is the content of the zeroth law of thermodynamics. On the microscopic scale, temperature can be defined as the average energy in each degree of freedom in the particles in a system. Because temperature is a statistical property, a system must contain a few particles for the question as to its temperature to make any sense. For a solid, this energy is found in the vibrations of its atoms about their equilibrium positions. In an ideal monatomic gas, energy is found in the translational motions of the particles; with molecular gases, vibrational and rotational motions also provide thermodynamic degrees of freedom.

Temperature is measured with thermometers that may be calibrated to a variety of temperature scales. In most of the world (except for Belize, Myanmar, Liberia and the United States), the Celsius scale is used for most temperature measuring purposes. The entire scientific world (these countries included) measures temperature using the Celsius scale and thermodynamic temperature using the Kelvin scale, which is just the Celsius scale shifted downwards so that 0 K= −273.15 °C, or absolute zero. Many engineering fields in the U.S., notably high-tech and US federal specifications (civil and military), also use the kelvin and degrees Celsius scales. Other engineering fields in the U.S. also rely upon the Rankine scale (a shifted Fahrenheit scale) when working in thermodynamic-related disciplines such as combustion.

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