Eli5 How are you able to still hit notes when you hum and why do you run out of breath more quickly when you hum?

Question

Eli5 How are you able to still hit notes when you hum and why do you run out of breath more quickly when you hum?

In: 3

Answer 1

The previous answer covers the first question well. For the second part, and this is just a guess, you probably move more air when humming to compensate for your nostrils not being as good at projecting sound as your mouth.