Here's why:
* Short vowel sounds are typically quick and sharp. They are often represented by a single vowel letter.
* Long vowel sounds are typically longer and drawn out. They are often represented by a vowel letter followed by a silent "e" or another vowel.
The "o" in "home" makes a short "o" sound, similar to the "o" in "hot" or "box". This sound is quick and sharp, characteristic of a short vowel.