Other factors that affect liquid flow rate include the liquid's viscosity and density, and the friction of the liquid in contact with the pipe. Direct measurements of liquid flows can be made with positive-displacement flowmeters. These units divide the liquid into specific increments and move it on.
And while the number of people dying while waiting for an organ transplant has decreased from 614 in 2011 to 469 in 2014, there have still been 195 individualsâ deaths this year after patients failed to find a donation in time.
Last week, NHSBT revealed that there were more than 4,000 organ transplants in 2012/13, a new milestone. There are 19m people on the Organ Donor Register, almost one in three people in Britain. But those behind the register insist more can be done. At any one time, 10,000 people are waiting for a life-saving transplant and Britain is lagging behind nations such as Spain, Croatia and the US when it comes to organ donation.