Explanation:

Shwaas :

• Shwaas, a portable medical oxygen concentrator, was also developed by the VSSC. It can provide 10 litres of enriched oxygen per minute, which is enough for two patients at once.
• Shwaas increases the oxygen gas content by selectively removing nitrogen gas from ambient air using a process known as Pressure Swing Adsorption (PSA), which is widely used to produce oxygen from air.