T4暖通专业英语课件分析.ppt

Unit 1 Thermodynamics and Heat Transfer Text 4 Radiation Question 1. What is radiation? 2. Why radiation is the only type of heat transfer that can travel through a vacuum? 3. How dose radiation emit? 4. What‘s the relation of the frequency of vibration and wavelength of radiation and the velocity of radiant waves? 1. Radiation is the act or process of radiant, as energy in the form of particles or waves. When the motion state of particles in a material changes, it would radiate energy. radiation [,reidi‘ei??n] : n. 辐射；放射；放射物 infrared radiation 红外辐射 radiant [‘reidi?nt] : a.放热的; 发光的; 辐射的；radiant energy辐射能 radiate [‘reidieit] : vt. 辐射；发射； particle [‘pɑ:tikl] ：n.微粒, 颗粒, 〈物〉粒子 ，极少量 particle diameter 颗粒直径 particulate matter 颗粒物 Theres not a particle of truth in her story. 2.Heat transferred by radiation travels through space without heating the space and is absorbed by the first solid object that it encounters. absorb [?b‘s?:b] ：vt. 吸收；吸引； absorb in 全神贯注于… She was absorbed in study. This job absorbs all of my time. solid [‘s?lid] ：a. 固体的；可靠的 n.固体 solid waste 固态废弃物 solid state 固态 solid wood 实木 Ice is water in a solid state. I know that James is a solid type of person. encounter [inkaunt?] ：vt.遇到, 遭遇；偶然碰到, 邂逅 1.She encountered an old friend on the road. 2.We encounter so many problems in our work. transfer [tr?ns‘f?:] ：n. 转让；转移 vt.转让 1.Please transfer the money to my account. 2.I intend to transfer the property to my son. Trans-表“横贯，转换”之意 Transport n/v.运输 Transmission n.传输 3.The frequency of vibration (f) of radiant waves is dependent solely on the source of radiation and is independent of the medium through which they pass. frequency [‘fri:kw?nsi] ： n. 频率 radio frequency 无线电频率 high frequency 高频 low frequency 低频 intermediate frequency中频 vibration [va?‘bre???n] ：n.震动；共鸣 1.I am drawn to that girl; I get good vibrations from her. 2. Their instruments can detect the slightest vibration source [s?:s] ：n. 来源；水源；发源地； light source 光源 water source