Here's why:
* Short 'o' sound: The vowel sound in "blow" is a short 'o' sound, similar to the vowel sound in "hot" or "lot".
* Long vowel sound: A long vowel sound is typically represented by a single vowel letter followed by a silent 'e' at the end of the word (like "make", "hope", or "time").
Therefore, "blow" has a short 'o' sound.