Vacuum tube

Peroxide (VHP®) Sterilization. The hydrogen peroxide plasma sterilization works by first filling the hydrogen peroxide plasma sterilizer with the objects to be sterilized. The basic hydrogen peroxide plasma sterilization cycle consists of four stages (vacuum generation, H2O2 injection, diffusion, and plasma discharge) and takes approximately 1 to 3 hours. Hydrogen peroxide plasma sterilization inactivates microorganisms primarily by the combined use of hydrogen peroxide gas and the generation of…

The World War I ended by 1918 and Europe was destroyed. People were sad most of the places due to the family they lost in the war. When it hit the 1920s people started to feel happier in towns and cities which was known as the boom. People were enjoying their life by getting products in a cheaper price and an increase in income.The 1920s-1940s was the time in which new inventions were invented which are still used in 2014, invention like Walkie Talkie. Donald Hings, the inventor of the walkie…

Magnesium (1.5 g) was stirred vigorously, to combat oxidation and pulverize the by-product magnesium sulfate, in a 250 mL round bottom flask for 5 to 10 minutes, then fit with reflux apparatus – including CaCl2 Drying Tube, 125 mL Dropping funnel, Claisen adapter, and thermometer adapter – and add anhydrous ethyl ether (40mL) through the dropping funnel. Bromobenzene (3mL) and Anhydrous Ethyl Ether (15mL) was added to the reaction flask through the dropping funnel dropwise and in halves. Reflux…

nine test tubes were obtained. One test tube…

fill a beaker with sodium bicarbonate, enough to fill the syringe. The plunger was added to the syringe and enough sodium bicarbonate was pulled to fill the syringe ¾ full. After removing the air bubbles, the tip was covered with a gloved thumb and vacuum pressure was created. We observed the air bubble being released from the spinach disks and released pressure to allow the sodium bicarbonate to take the bubble’s place. This process was repeated until all of the spinach disks were gathered in…

As a leading industrial seals distributor, Valley Seal provides Parker and Coorstek engineered sealing products. We at Valley Seal ensure a stock of the widest range of seals for customers to choose from. These include simple O-rings, rods wipers and scrapers, back-up rings, and custom molded rubber products. We also provide uniquely designed seals and fasteners from Parker. These sealing products will be discussed in this post. Three Uniquely Designed Parker Seals The seals and fastener…

like natural aromatic compounds which are insoluble in water, but volatile in steam. The non-volatile impurities are left behind in the flask. It once was a popular laboratory method for purification of organic compounds, but has become obsolete by vacuum distillation. Figure 6 Steam Distillation EXTRACTION WITH A SOLVENT The process of removing or separating a substance from its aqueous solution using a suitable organic solvent is called extraction. It relies on variations in the solubility…

her article 1920’s radio they were the first ever licensed radio station that was broadcasted on November 2, 1920. By 1922 there were over five hundred radio stations in America. Edward S. Rogers, Sr. invented the line operated vacuum tube radio receiver. The vacuum tube receivers were able to drive loudspeakers in turn allowed the whole family to listen at once. Today the modern day radio can be played through wireless speakers loud enough for an entire stadium to…

all-electric computer was invented by Professor John Atanasoff and his student Clifford Berry. The machine was called ABC. The ABC had been designed to solve sets of linear differential equations. It was as large as a desk and included 300 electronic tubes as switches and a 1,600 capacitor memory, but also had electromechanical…

Ferhan Abdullah Thursday, 09 November 2016 Experiment 7 The Separation of Three Organic Compounds by Acid-Base Reactions and Liquid-Liquid Extractions Abstract: The purpose of the experiment was to isolate the three mixtures 9-fluorenone , benzoic acid and benzocaine by the liquid-liquid extraction method and the acid-base reaction technique. Using the acid-base reaction technique, the acid and base are neutralized, producing salt and water. By using the liquid-liquid extraction method, two…