Why isn't millies hand burned when she holds it above the escape valve of the pressure cooker?

Millie's hand isn't burned when she holds it above the escape valve of the pressure cooker because the steam escaping is not in direct contact with her skin for an extended period. The steam dissipates quickly into the air, and while it is hot, the distance and brief exposure prevent significant heat transfer. Additionally, the pressure cooker is designed to release steam safely, minimizing the risk of burns.