Filter paper. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Filter paper. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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That filter paper does not break through so quickly, which often happens when filtering large amounts of liquid, a simple tool is recommended, which, while significantly increasing the strength of the filter paper, at the same time does not at all reduce its filtering ability.

This means that the paper is immersed for a few seconds in nitric acid with a specific gravity of 1,42 and then immediately thoroughly washed in water.

The paper prepared in this way can be washed and crumpled like a sheet; it becomes so strong that a strip of ordinary filter paper 5-6 cm wide can withstand a weight of 1,5 kg, while the same strip, not subjected to the action of nitric acid, is torn from the weight of 150 g, i.e. ten times weaker.

Author: Korolev V.A.

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Random news from the Archive

Stratostatic Internet 19.12.2005

In Sweden, tested transmitters mounted on a stratosphere balloon.

Participants of the European project "Kapanina" (named after the cafe where the main idea of the project originated) want to provide all the inhabitants of the planet, and especially those living in remote areas, with the possibility of broadband access to the global network. To do this, they propose to place repeaters on stratostats - huge airships flying in the stratosphere. Such an organization of communication will be very cheap, since it is not necessary to build numerous masts in difficult places.

In October 2005, important tests were carried out in Sweden. On a stratospheric balloon with a volume of 12 thousand cubic meters, devices for transmitting radio and optical signals were fixed, and then it was raised to a height of 24 km. During the nine hours of the flight, it was possible to send and receive information more than once, and the ground points at which this was done were located at a distance of 60 kilometers from the launch site. And the stratospheric balloon itself was constantly moving, obeying the air currents.

The radio data transfer rate was 4 Mb/s, and the optical signal gave a record speed of 1,25 Gb/s. Such huge speeds, possible due to the direct transmission of a laser beam through rarefied air, will be used in the future for the exchange of information between stratospheric balloons. And the radio channel will provide communication with terrestrial clients of the network.

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