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London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.

New Delhi, Jun 27: Prime Minister Narendra Modi on Saturday said that India fared much better compared to some other countries in the fight against the COVID-19 pandemic. The PM made this observation while delivering the inaugural address to mark the 90th birth anniversary celebrations of Reverend Dr Joseph Mar Thoma Metropolitan.

"Earlier this year, some people had predicted that the impact of the virus in India would be very severe. Due to lockdown, many initiatives have been taken by the Government and in this people-driven fight, India is much better placed than many other nations. India's recovery rate is rising," Modi said in his virtual address.

He further warned that the time was not apt to "let our guard down".

The prime minister greeted the Mar Thoma Metropolitan and wished him a "long life and best health."

"Dr Joseph Mar Thoma has devoted his life for the betterment of our society and nation. He has been particularly passionate about the removal of poverty and women empowerment," the prime minister said.

Praising the Mar Thoma Church for its contributions to the country the Prime Minister added that it has worked to bring a positive difference in the lives of people in the country in areas of healthcare and education.

"The Mar Thoma Church is closely linked with the noble ideals of Saint Thomas, the Apostle of Lord Christ. India has always been open to spiritual influences from many sources. It is with this spirit of humility that the Mar Thoma Church has worked to bring a positive difference in the lives of our fellow Indians," Modi said.

Followers of the Mar Thoma Church from India and abroad participated in the programme through video conference.

New Delhi, Mar 14: Excise duty on petrol and diesel was on Saturday hiked by ₹3 per litre as the government looked to mop up gains arising from fall in international oil prices.

Special excise duty on petrol was hiked by ₹2 to ₹8 per litre incase of petrol and to Rs 4 incase of diesel, an official notification said.

Additionally, road cess on petrol was raised by ₹1 per litre each on petrol and diesel to ₹10.

The increase in excise duty would in normal course result in a hike in petrol and diesel prices but most of it would be adjusted against the fall in rates that would have necessitated because of slump in international oil prices.