Eventually he designed a double-walled glass flask and removed the air from the space between the two walls, creating a vacuum. Liquid put inside the flask stays at the same temperature because ...

This clip shows how a vacuum flask prevents heat loss. Detail of the design of the flask to prevent conduction, convection, radiation and evaporation is given. This includes the vacuum ...

As the neck-to-neck battle between Republican presidential nominee Donald Trump and Democratic candidate Kamala Harris continued in the ongoing US presidential elections, its reflection was felt ...