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Thermodynamics

In physics, thermodynamics (from the Greek θερμη, therme, meaning "heat"[1] and δυναμις, dynamis, meaning "power") is the study of the conversion of heat energy into different forms of energy (in particular, mechanical, chemical, and electrical energy); different energy conversions into heat energy; and its relation to macroscopic variables such as temperature, pressure, and volume. Its underpinnings, based upon statistical predictions of the collective motion of particles from their microscopic behavior, is the field of statistical thermodynamics, a branch of statistical mechanics.[2][3][4] Roughly, heat means "energy in transit" and dynamics relates to "movement"; thus, in essence thermodynamics studies the movement of energy and how energy instills movement. Historically, thermodynamics developed out of need to increase the efficiency of early steam engines.[5]

The starting point for most thermodynamic considerations are the laws of thermodynamics, which postulate that energy can be exchanged between physical systems as heat or work.[6] They also postulate the existence of a quantity named entropy, which can be defined for any system.[7] In thermodynamics, interactions between large ensembles of objects are studied and categorized. Central to this are the concepts of system and surroundings. A system is composed of particles, whose average motions define its properties, which in turn are related to one another through equations of state. Properties can be combined to express internal energy and thermodynamic potentials, which are useful for determining conditions for equilibrium and spontaneous processes.

With these tools, thermodynamics describes how systems respond to changes in their surroundings. This can be applied to a wide variety of topics in science and engineering, such as engines, phase transitions, chemical reactions, transport phenomena, and even black holes. The results of thermodynamics are essential for other fields of physics and for chemistry, chemical engineering, aerospace engineering, mechanical engineering, cell biology, biomedical engineering, materials science, and economics to name a few.[8][9]

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How to Take Your Temperature and Get the Most Accurate Reading ...

Instructions

Difficulty: Moderately Easy Step1
Use an accurate thermometer.

Although digital thermometers have replaced the old-fashioned mercury ones in many cases, the mercury thermometer still gives a more accurate reading. Sometimes simpler is better.
Step2
Resist the urge to talk.

Talking while you have a thermometer in your mouth is almost sure to alter the results by allowing cooler air to enter your mouth. Hold your thoughts until the thermometer comes out.
Step3
Don't eat or drink before taking your temperature.

Hot or cold foods or liquids can give a false reading. Hold off on eating or drinking for at least ten minutes before taking your temperature.
Step4
Don't remove it prematurely.

The longer you leave the thermometer in your mouth, the more accurate the reading will be. Conventional wisdom states that a thermometer should be kept under your tongue for three to five minutes. An additional minute of two is even better.
Step5
Position the thermometer accurately.

Make sure the thermometer is placed securely under your tongue to get the most accurate reading.