碘蒸气就是升华后的碘，有毒性，遇冷易凝华成固态碘。 固体碘是紫黑色，碘蒸气是深蓝色。 元素周期表53号元素碘，单质碘呈紫黑色晶体，易升华，升华后易凝华。有毒性和腐蚀性。 碘具有较高的蒸气压，在微热下即升华，纯碘蒸气呈深蓝色，若含有空气则呈紫红色，并有刺激性气味。
建立了以碘蒸气为标定物的激光调谐波长测定系统，实际测量了碘蒸气吸收谱线。
The experiment system for measuring wavelength was built up with iodine vapor as reference, and the iodine vapor absorption lines were measured.
这时候，一些放射性产物(铯、碘等)开始混入水和水蒸气中。
At this time, some of the radioactive fission products (cesium, iodine, etc.) started to mix with the water and steam.
在较高温度条件下，碘与铝在封闭的真空玻璃管中直接反应，产生碘化铝蒸气。
The direct reaction of Al with I_2 at high temperature in a closed vacuum glass tube resulted in AlI_3 vapor.
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