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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.

Davos, Jan 20: India's richest 1 per cent hold more than four-times the wealth held by 953 million people who make up for the bottom 70 per cent of the country's population, while the total wealth of all Indian billionaires is more than the full-year budget, a new study said on Monday.

Releasing the study 'Time to Care' here ahead of the 50th annual meeting of the World Economic Forum (WEF), rights group Oxfam also said the world's 2,153 billionaires have more wealth than the 4.6 billion people who make up 60 per cent of the planet's population.

The report flagged that global inequality is shockingly entrenched and vast and the number of billionaires has doubled in the last decade, despite their combined wealth having declined in the last year.

"The gap between rich and poor can't be resolved without deliberate inequality-busting policies, and too few governments are committed to these," said Oxfam India CEO Amitabh Behar, who is here to represent the Oxfam confederation this year.

The issues of income and gender inequality are expected to figure prominently in discussions at the five-day summit of the WEF, starting Monday. The WEF's annual global risks Report has also warned that the downward pressure on the global economy from macroeconomic fragilities and financial inequality continued to intensify in 2019.

Concern about inequality underlies recent social unrest in almost every continent, although it may be sparked by different tipping points such as corruption, constitutional breaches, or the rise in prices for basic goods and services, as per the WEF report.

Although global inequality has declined over the past three decades, domestic income inequality has risen in many countries, particularly in advanced economies and reached historic highs in some, the Global Risks Report flagged last week.

The Oxfam report further said "sexist" economies are fuelling the inequality crisis by enabling a wealthy elite to accumulate vast fortunes at the expense of ordinary people and particularly poor women and girls.

Regarding India, Oxfam said the combined total wealth of 63 Indian billionaires is higher than the total Union Budget of India for the fiscal year 2018-19 which was at Rs 24,42,200 crore.

"Our broken economies are lining the pockets of billionaires and big business at the expense of ordinary men and women. No wonder people are starting to question whether billionaires should even exist," Behar said.

As per the report, it would take a female domestic worker 22,277 years to earn what a top CEO of a technology company makes in one year.

With earnings pegged at Rs 106 per second, a tech CEO would make more in 10 minutes than what a domestic worker would make in one year.

It further said women and girls put in 3.26 billion hours of unpaid care work each and every day -- a contribution to the Indian economy of at least Rs 19 lakh crore a year, which is 20 times the entire education budget of India in 2019 (Rs 93,000 crore).

Besides, direct public investments in the care economy of 2 per cent of GDP would potentially create 11 million new jobs and make up for the 11 million jobs lost in 2018, the report said.

Behar said the gap between rich and poor cannot be resolved without deliberate inequality-busting policies, and too few governments are committed to these.

He said women and girls are among those who benefit the least from today's economic system.

"They spend billions of hours cooking, cleaning and caring for children and the elderly. Unpaid care work is the 'hidden engine' that keeps the wheels of our economies, businesses and societies moving.

"It is driven by women who often have little time to get an education, earn a decent living or have a say in how our societies are run, and who are therefore trapped at the bottom of the economy,” Behar added.

Oxfam said governments are massively under-taxing the wealthiest individuals and corporations and failing to collect revenues that could help lift the responsibility of care from women and tackle poverty and inequality.

Besides, the governments are also underfunding vital public services and infrastructure that could help reduce women and girls' workload, the report said.

As per the global survey, the 22 richest men in the world have more wealth than all the women in Africa.

Besides, women and girls put in 12.5 billion hours of unpaid care work each and every day -- a contribution to the global economy of at least USD 10.8 trillion a year, more than three times the size of the global tech industry.

Getting the richest one per cent to pay just 0.5 per cent extra tax on their wealth over the next 10 years would equal the investment needed to create 117 million jobs in sectors such as elderly and childcare, education and health.

Governments must prioritise care as being as important as all other sectors in order to build more human economies that work for everyone, not just a fortunate few, Behar said.

Oxfam said its calculations are based on the latest data sources available, including from the Credit Suisse Research Institute's Global Wealth Databook 2019 and Forbes' 2019 billionaires list.