yes but not permanently. There's is heat loss where the inner bottle meets the outer casing at the "neck" area. They scan also keep liquids cold.
It keeps the air trapped in side and has to layers with air as insulation in the middle
Thermoses are secluded drink and food containers, used to keep whatever they contain safe and healthy.
I usually microwave an ice pack for 30 seconds then rubber band it around the thermos.
use insulation to keep the water hot for 40 minutes
keep it in a hot place
polystyrene
No, It doesn't. If you want to keep hot water hot for a longer time use a polystirene cup.
PEX pipe will keep it hot longer than copper.
thaw it under the sink with hot water. then keep it in a bucket of hot water
try covering the glass, so the heat particles stay inside the cup, and the hot water stays hot.
To keep the water hot longer. Saves on heating costs.
Hot water works just keep rubbing hot water and soap it happend to me