What would happen to your naked arm in the vacuum of outer space?
如果把手暴露在外太空的真空环境中会怎么样？
原文地址：https://www.quora.com/What-would-happen-to-your-naked-arm-in-the-vacuum-of-outer-space
Something very similar happened to Joseph Kittinger, a skydiver that climbed to 31 kilometers (101,800 feet) on a hot air balloon to break the record of altitude jumping.
十分类似的事情曾发生在特技跳伞员 Joseph Kittinger 身上，当时他正通过热气球上升至 31 公里的高度，准备打破高空跳伞的世界纪录。
One glove of his suit had a pressurization failure and his hand was exposed to the (almost) vacuum. It swelled to twice its volume, and he had a lot of pain. After coming back to ground level, his hand came back to normal size and function after 2 hours.
他的保护服的一只手套耐压出现了问题导致他的手臂（几乎）处于真空环境中。手臂膨胀成平常的两倍大小，让他痛苦非常。在返回地面之后，他的手臂变成正常大小并在两个小时之后恢复如常。
