Western wildfire smoke plumes are getting taller

In recent years the plumes of smoke crawling upward from Western wildfires have trended taller, with more smoke and aerosols lofted up where they can spread farther and impact air quality over a wider area. The likely cause ...

China swelters under record heat

Cities across China were on red alert for heatwaves on Monday, as tens of millions of people were warned to stay indoors and record temperatures strained energy supply.

Record temperatures set across US as heat wave engulfs nation

A relentless US heat wave that has triggered health alerts for more than 100 million people is set to intensify this weekend, with temperatures and humidity forecast to surge to suffocating highs in many parts of the country.

Summer swelter: Persistent heat wave breaks records, spirits

From the normally chilly Russian Arctic to the traditionally sweltering American South, big swaths of the Northern Hemisphere continued to sizzle with extreme heat as the start of summer more resembled the dog days of August ...

page 1 from 27

Air conditioning

Air conditioning refers to the cooling and dehumidification of indoor air for thermal comfort. In a broader sense, the term can refer to any form of cooling, heating, ventilation or disinfection that modifies the condition of air. An air conditioner (often referred to as AC or air con.) is an appliance, system, or mechanism designed to stabilise the air temperature and humidity within an area (used for cooling as well as heating depending on the air properties at a given time), typically using a refrigeration cycle but sometimes using evaporation, most commonly for comfort cooling in most buildings and motor-cars.

The concept of air conditioning is known to have been applied in Ancient Rome, where aqueduct water was circulated through the walls of certain houses to cool them. Similar techniques in medieval Persia involved the use of cisterns and wind towers to cool buildings during the hot season. Modern air conditioning emerged from advances in chemistry during the 19th century, and the first large-scale electrical air conditioning was invented and used in 1902 by Willis Haviland Carrier.

This text uses material from Wikipedia, licensed under CC BY-SA