A rotary evaporator consists of a round flask in a bath of hot water that is designed to evaporate solvents. The flask is rotated and the solvent collects under a vacuum onto a condenser and drips into a condensate collecting flask. in this way solutions can be concentrated or purified. By attaching a vacuum pump, the air pressure and therefore the boiling point of the fluid can be decreased
रासायनिक प्रतिक्रिया हुँदा नत पिण्डको क्षति हुन्छ न प्राप्त हुन्छ । प्रतिक्रियामा जाने सम्पूर्ण वस्तुको पिण्ड प्रतिक्रियाको प्रतिफलको पिण्डको जोडसँग बराबर हुन्छ ।KDE40.1 KDE40.1
Proper tire maintenance involves three things: maintaining the correct air pressure, rotating the tires regularly, and keeping them properly balanced and aligned.
(Note: In this letter, Newton tried to explain the refraction of light by arguing that rotating particles of light curve as they moved through a medium just as a rotating tennis ball curves as it moves through the air.)