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Science of Everyday Things Vol. 2 - Physics Episode 9

Tham khảo tài liệu 'science of everyday things vol. 2 - physics episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | T EMPERATURE KEY TERMS CONTINUED MOLECULAR TRANSLATIONAL ENERGY The kinetic energy in a system produced by the movement of molecules in relation to one another. SYSTEM In physics the term system usually refers to any set of physical interactions or any material body isolated from the rest of the universe. Anything outside of the system including all factors and forces irrelevant to a discussion of that system is known as the environment. TEMPERATURE A measure of the average kinetic energy or molecular translational energy in a system. Differences in temperature determine the direction of internal energy flow between two systems when heat is being transferred. THERMAL ENERGY Heat energy a form of kinetic energy produced by the movement of atomic or molecular particles. The greater the movement of these particles the greater the thermal energy. THERMAL EQUILIBRIUM The state that exists when two systems have the same temperature. As a result there is no exchange of heat between them. THERMODYNAMICS The study of the relationships between heat work and energy. THERMOMETRIC MEDIUM A substance whose properties change with temperature. A mercury or alcohol thermometer measures such changes. THERMOMETER A device that gauges temperature by measuring a temperaturedependent property such as the expansion of a liquid in a sealed tube or resistance to electric current. TRIPLE POINT The temperature and pressure at which a substance is at once a solid liquid and vapor. VACUUM Space entirely devoid of matter including air. er temperature readings than those offered by a thermometer containing a traditional thermometric medium. Resistance thermometers are highly reliable but expensive and are used primarily for very precise measurements. More practical for everyday use is a thermistor which also uses the principle of electric resistance but is much simpler and less expensive. Thermistors are used for providing measurements of the internal temperature of food for instance and for .