science outline chemistry air lab laboratory physics apparatus thermal expansion experimant Thermal Expansion Of Air clip art 热 扩大 灰度 热空气膨胀的剪贴画
Round bottemed flask with bung and tube. black and white diagram / outline. Also with ink drop to show thermal expansion From GENERAL SCIENCE BY BERTHA M. CLARK, PH.D. (Gutenberg EBook 16593) 瓶 桶口 圆 bottemed 圆底烧瓶
science diagram round burner flask air bubbles grayscale trace heat classroom experiment bunsen bottemed thermal expansion Thermal Expansion Of Air clip art 热 扩大 灰度 热空气膨胀的剪贴画
This is clipart converted and broken apart that has been released into the public domain because the document says so, and its from NASA, a USA government agency. The publication is called "The Brain in Space:" http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/The.Brain.in.Space.html 美国国家航空航天局 空间 科学 58294main_The.Brain.in.Space-页面-47-孩子-课堂
black science diagram simple white cartoon burner lineart classroom bunsen Bunsen Burner Lineart clip art 本生灯 燃烧器 艺术线条 本生灯艺术线条剪贴画
black bottom science diagram white round flask lineart tube trace classroom experiment with bottemed bung Round Bot Flask clip art 一轮 瓶 桶口 圆 Bot 烧瓶剪贴画