Measurement
The measurement radical and the measurement kanji are exactly the same.
If you make sure to know the radicals, you'll also make sure to know the kanji too, automagically.
すん
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You want to measure something... something that will make you famous. You decide you'll measure the biggest mass in our solar system. We're talking about the sun (すん).
Imagine yourself deciding to do this. First step is to get a ridiculously long measuring tape. Then, you go up to the sun and start measuring. You immediately start getting burned. Feel the pain of the heat from the sun. Think about how this really probably wasn't a good idea. You still go forward, though, doing your best to measure the sun. Ouch, ouch, ouch.