convection current 是什么意思

	1.	Within the rock which forms the highly permeable reservoir convection currents of hot water or steam occur . 在形成高渗透性热储的岩体内，存在水或蒸汽的对流运动。
	2.	The ends of the tubular furnace are closed to minimize convection currents inside the furnace 把管式炉的前后端盖紧，是炉内的对流减少到最低限度。
	3.	Hot water is likewise less dense than cold water and rises , causing convection currents which transport energy 热水是同样密度较低，比冷水上升，造成对流电流，其中运输能源。
	4.	The spacing between each sheet of glass is important - if it is too narrow , the insulation effect will be poor ; if it too wide , convection currents may encouraged , which increase heat transfer 每片玻璃之间的距离是非常重要的? ?如果间距太小，保温隔热性能就很差；间距太大，对流增强，热传递增多。
	5.	Over ages , hot convection currents in this sea , as well as gravitational forces , move the plates and their superimposed continents and ocean basins , tearing them apart and rearranging them like pieces of a giant jigsaw puzzle 随著岁月流逝，海中热对流及重力移动板块及覆盖在上面的大陆块和海洋盆地，将它们撕裂再重新组合，如大拼图游戏的碎片。

convection current是什么意思