Which pair of symbols is written correctly?
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The prefix kilo is a lower-case k, while mega is a capital M. A lower-case m is already taken: it is the prefix milli, so mW means milliwatt, not megawatt.
The prefix kilo is a lower-case k, while mega is a capital M. A lower-case m is already taken: it is the prefix milli, so mW means milliwatt, not megawatt.