Safety learning aids to experiment with heat transfer in gas

摘要

A safety learning tool for experimenting with heat transfer in a gas is disclosed. The present invention disclosed is an upper opening-type lower case having an intake hole for inhaling external air; a PTC heating element that is built into the lower case so as not to block the intake hole and generates heat by connecting a power source; a lower opening-type upper case coupled to the upper portion of the lower case and having an exhaust hole through which air heated by the PTC heating element is exhausted; and a plastic bag fixed by hanging on the upper case, with an opening facing the exhaust hole of the upper case, and having a thermochromic sticker attached to the surface that changes color depending on the air temperature or painted with oil-based zion paint. .