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A still is an apparatus used to distill liquid mixtures by heating to selectively boil and then cooling to condense the vapor. [1] A still uses the same concepts as a basic distillation apparatus , but on a much larger scale.
A glass still head, upside down. The rounded part was meant to be fitted on the top of the boiling flask. Black-and-white photo of object at the Wellcome Trust museum. The still head is another ancient type of air-cooled condenser. It consists of a roughly globular vessel with an opening at the bottom, through which the vapor is introduced.
A typically 25% efficiency standard solar still (not allowing for any recovery of rejected latent heat), as the latent heat of vaporization of water is 2.26 MJ per kilogram, [3] should evaporate 2.4 kg (or liters) of water per m 2 per day in a region with an average daily solar irradiation of 21.6 MJ/m 2 (250 watts/m 2), or 873 liters per year ...
In microbiological practices, constant shaking allows liquid-grown cell cultures grown to constantly mix with the air. Some key benefits of shaking water bath are user-friendly operation via keypad, convenient bath drains, adjustable shaking frequencies, bright LED-display, optional lift-up bath cover, power switch integrated in keypad and ...
Thermosyphon circulation in a simple solar water heater (not a working model; there is no water supply to replenish the tank when the tap is used). A thermosiphon (or thermosyphon) is a device that employs a method of passive heat exchange based on natural convection, which circulates a fluid without the necessity of a mechanical pump.
As a consequence, the fluid is displaced while the cooler fluid gets denser and the fluid sinks. Thus, the hotter volume transfers heat towards the cooler volume of that fluid. [2] Familiar examples are the upward flow of air due to a fire or hot object and the circulation of water in a pot that is heated from below.
Physically Natural circulation evaporators use a short tube bundle within the batch pan or by having an external shell and tube heat exchanger outside of the main vessel (as shown in the diagram) [1] External heating through heat exchangers is normally used as it has the advantage that it is not dependent on the calandria size or shape. As such ...
To do this, a sample was harvested and placed onto a sterile dish and into the incubator. The air in the incubator was kept at 37 degrees Celsius, the same temperature as the human body, and the incubator maintained the atmospheric carbon dioxide and nitrogen levels necessary to promote cell growth.
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