It is because when you hum, you are actually exhaling, so if both your mouth and your nose is closed, the air can't escape. So, although you can hum for a very brief few second or two, you will be forced to open your mouth and catch your breath.
You can hum as long as your mouth and/or your nose is open, but if both are closed you cannot hum. When your mouth and nose are closed, the air flow stops. Thus, the vibrations stop and with it sound stops.
Explanation:
It is because when you hum, you are actually exhaling, so if both your mouth and your nose is closed, the air can't escape. So, although you can hum for a very brief few second or two, you will be forced to open your mouth and catch your breath.
Answers & Comments
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It is because when you hum, you are actually exhaling, so if both your mouth and your nose is closed, the air can't escape. So, although you can hum for a very brief few second or two, you will be forced to open your mouth and catch your breath.
Answer:
You can hum as long as your mouth and/or your nose is open, but if both are closed you cannot hum. When your mouth and nose are closed, the air flow stops. Thus, the vibrations stop and with it sound stops.
Explanation:
It is because when you hum, you are actually exhaling, so if both your mouth and your nose is closed, the air can't escape. So, although you can hum for a very brief few second or two, you will be forced to open your mouth and catch your breath.