Everything else being equal , a cold air column , because of its higher air density , is heavier than a warm air column and thus produces a higher air pressure 在一般相同情况下，冷空气柱因其密度较高，会比暖空气柱重，因而产生气压较大
For this reason , everything else being equal , the air pressure which is the weight of air column above a place can vary from place to place on the earth because of the slight changes in gravity 因此在一般相同情况下，气压上空空气柱的重量在地球各地均会因重力稍为不同而有所变化。
For this reason , everything else being equal , the air pressure ( which is the weight of air column above a place ) can vary from place to place on the earth because of the slight changes in gravity 因此在一般相同情况下，气压（上空空气柱的重量）在地球各地均会因重力稍为不同而有所变化。
When the natural frequency of the gas column in the inlet valve is consistent with the main frequency of the periodic air inlet noise , the resonance noise of the gas column will also become prominent in the air inlet noise 进气管空气柱的固有频率与周期性进气噪声的主要频率相一致时，空气柱的共振噪声在进气噪声中也会较为突出。
By the line s - h sensor mentioned in chapter 3 , measurements have been made to a beam path heated by hf laser . by a high speed interferometer , tomographic measurement was made on a air column heated by electric powered wire 用第三章设计的线阵s - h传感器对hf激光加热光路进行了测量研究,在此基础上,用高速干涉仪对电热丝加热的空气柱进行了模拟层析测量研究。
