Vacuum Flasks

[vehelpfulguy]

If you put hot food in it stays hot.

If you put cold food in it stays cold

How does it know ?

[mibn2cweus]

Heat is transferred through conduction (solid contact), convection (fluid mixing) and radiation (light). These three possibilities are isolated and limited by the construction of the vacuum flask.

[dzug]

It doesn't.

It just keeps it at the temperature it is, more or less

[scotstone]

There is a little switch on the bottom of the flask.

[zigzag]

An Irishman at work sees one of his fellow workers with a vacuum flask pouring tea from it and asks: " What is that?" His mate replies, "It's a vacuum flask, it keeps hot things hot and cold things cold." He adds, haven't you seen one before?" "No" replies the Irishman. The following day the Irishman returns to work with a brand new vacuum flask and upon seeing him his mate states, " I see you bought one then" "Yes I did" says the Irishman. "What have you got in it?" asks his mate, to which the Irishman replies, " Coffee and two ice creams

[CSG2306]

Hi vehelpfulguy,

Scotstone has given away a state secret, he will be sent to the stocks in the Tower and lashed with a thousand feathers, sorry tarred with a thousand feathers.

Regards

[wilsarnie]

I'll have a coffee and a choc ice please