In , Scottish scientist Sir James Dewar invented the vacuum flask. Through his work in cryogenics, he identified a need to keep a chemical placed in a flask at a stable temperature. To do this, Dewar placed a glass bottle in another larger glass bottle, and evacuated the air between the two bottle walls. About Thermos. All products are manufactured with the latest superior technology and strict quality controls. All of the thermoses we tested kept drinks hot over the course of a long day, but the Stanley Classic Legendary Bottle 2.
A thermos is built on the principles of all three heat-transfer methods. The inner and outer coatings are highly reflective to prevent radiation. A layer of empty space called a vacuum chamber limits conduction and convection and the lid is a good insulator thus preventing conduction. Silver thread, known for its protective anti-radiation properties provides a real protection against electromagnetic radiation.
The vacuum between the two walls prevents heat transfer through conduction or convection from the inside to the outside and reverse. Thermos also has a silver lining in the inner wall that prevents heat transfer through radiation as blocks any inner heat to go out through radiation. This is why lead aprons and blankets are the most effective shielding material to fight off x-rays and gamma-ray. After all, lead has a very high number of protons in each atom 82 to be specific , which makes it a very dense metal shield.
Silver Fabrics: Pure Silver coated onto nylon was used first as an antibacterial fabric that blocks Joined: Sep 5, Posts: 22, Posts: 25, Enthalpetic intuition. I gave you the answer. Joined: Dec 20, Joined: Dec 15, Posts: 5, User Profile Private Message.
Each thermos has the soul of a Chinese child inside it. That's why Chinese people are only allowed to keep one kid. They're contractually obligated to give all their excess kids to Thermos Corp.
Joined: Aug 31, Posts: 1, Joined: Jul 16, Posts: 31, The principle involved is to surround a container with material that is a good thermal insulator, which will not conduct heat or cold. A unique way of keeping material its original temperature is to use a vacuum as an insulator. Joined: Feb 5, Posts: 35, This brings to mind my very favorite Aggie joke: An Aggie and a Clemson Tiger were working at the construction site and it's lunchtime.
The Clemson Tiger pulls out his sandwich, and a thermos. The Aggie asks, "What's that? It keeps hot things hot and cold things cold. He asks, "What's that? Joined: Oct 31, Is this too much for your little pea brain to comprehend?? Joined: Apr 13, Although heat transfer through these paths is small, it is not zero.
Does the thermos know whether the fluid inside it is hot or cold? All the thermos is doing is limiting heat transfer through the walls of the thermos. That lets the fluid inside the thermos keep its temperature nearly constant for a long period of time whether the temperature is hot or cold.
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