The Thermos Flask
Thermos flasks is one of the best and interesting topic in physics it is used to keep drinks warm or cold. They are usually made of stainless steel, glass or plastic and have a lid with a tight gasket.
Thermos flasks is also as (vacuum flask). They are designed to slow down all forms of heat transfer, including conduction, convection and radiation. These three types of heat transfer are the main ways that hot and cold liquids are transferred from one place to another.
Conduction
Conduction is a form of heat transfer between substances in direct contact with each other. It happens when a substance is heated, its particles gain energy and vibrate more, bumping into each other.
This vibration continues until the thermal energy is transferred from one end of the substance to the other. Often this is very quick and can be seen when metal spoons get hot in boiling tea or the handle of a pan with hot water gets warm after a few minutes.
A thermos flask is a double-walled glass container that keeps a liquid hot or cold for an extended period. Thermos flasks are designed to keep heat transfer to a minimum by preventing it via three different modes: conduction, convection, and radiation.
Thermos flasks prevent most heat transfer through conduction by using a vacuum between the walls. The lid of the flask also stops convection (by preventing air from circulating around the container) and the inner and outer surfaces of the container are mirrored, which reduces heat loss by radiation.
Convection
Convection is the process of heat transfer by the mass movement of molecules within fluids, such as gaseous or liquid substances. It takes place through advection, diffusion or both.
A Thermos Flask (also known as a Dewar flask) is a vacuum-insulated, super-insulated bottle that can keep hot drinks hot and cold drinks cold for hours or even days at a time. It is based on the design of a patent by Reinhold Burger in 1907 (US Patent #872,795: Double-walled vessel with a space for a vacuum between the walls).
The flask has an inner chamber and a separate outer plastic or metal case with two glass vessels separated by a reflective layer, which also acts as insulation to prevent heat from escaping from the liquid inside. The outer shell is tight-screwed to the inner chamber, and the flask is air-tight by means of a screw-down stopper.
Radiation
Radiation is a type of energy that comes from a source and travels through space at the speed of light. It has an electric field and a magnetic field, and it is wave-like in nature.
There are many different kinds of radiation in nature, including x-rays, gamma rays, and other high-energy forms. These types of radiation have a lot of energy and can damage your body if you are exposed to too much.
Fortunately, scientists understand radiation and can use it to benefit humans. They can detect radioactive materials and diagnose cancer.
Radiation is also used to identify the elements in a sample of liquid or solid material. Scientists can do this by bombarding the sample with a certain type of radiation, which can determine the chemical composition of the sample.
Vacuum
Vacuum is a region of space that has no matter in it, like atoms or molecules. The word comes from Latin meaning “empty space, void.”
A vacuum is essential to many scientific experiments because it allows scientists to create an environment where the physics of gasses are more precise than under standard conditions. This makes it easier to control and predict the chemistry of gases in labs.
Scientists often use double vacuum flasks to keep sensitive helium cylinders and other liquids inside for long periods of time. This is because a vacuum can maintain the temperature of an atom or molecule for longer than it could otherwise.
Vacuum flasks are insulated to reduce heat transfer by conduction and convection between the walls of the flask. When used for holding liquids, this also prevents condensation from occurring on the outside of the container, which helps to protect the contents against freezer burn. If this is add value to you please leave a comment below and if you have any suggestion as regards this topic please free free to let us know for more improvement.
