Here's why:
* Short vowel sound: The "a" in "barn" makes the short "a" sound, like in "cat" or "man."
* Long vowel sound: Long vowel sounds are typically represented by a vowel followed by a silent "e" (like "ate" or "hope") or by a double vowel (like "feet" or "moon").
Therefore, the vowel sound in "barn" is short, not long.