It is emphasized that the gas delivery tube must be disconnected from the reflux apparatus before removing the reaction from the heat source. Why is

It is emphasized that the gas delivery tube must be disconnected from the reflux apparatus before removing the reaction from the heat source. Why is this necessary?

.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 10px 20px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
border-radius: 10px;
}
.awasam-alert {
color: red;
}

 

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