They decline significantly from one year to the next because each barrel of oil taken from a reservoir reduces the pressure within the field, leaving less force available to push the next barrel of oil up the well.
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By focusing on the illegal activity of officers who were under pressure in the field, prosecutors are neglecting what was declared to be legal by policymakers in Washington.
With Red Bull unable to fix the problem and his title hopes sliding away, Vettel produced the drive of a champion, fighting his way from the back of the field to keep the pressure on Alonso.
The Iraqi oil ministry cancelled the contract after Lukoil refused to give in to pressure from Baghdad to start work on the field in breach of United Nations trade sanctions.
The research could put pressure on big drug companies to wade into the ethically complicated field of stem-cell research.
My 1979 dissertation was a model relating interannual and interseasonal variations in the shape of the atmosphere, as reflected by the surface barometric pressure field, to variations crop yields across the United States.
But continued Australian pressure eventually produced another score, again for Jennings in the same area of the field, after he was well set up by Darren Lockyer.
Nobody in sports had ever faced the sort of pressure, and abuse, that Jackie Robinson did when he took the field for the first time in a Brooklyn uniform on April 15, 1947.
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And Leeds' pressure told again just before half-time when the Rhinos switched play from one side of the field to the other before veteran centre Keith Senior got winger Hall over at the corner.
After 3 weeks of game-altering blown calls, on-field melees risking player safety, and mounting pressure from frustrated fans, players, media, and coaches alike, the NFL came to terms with the NFL Referees Association with a new 8-year labor contract.
The ruling military - the Supreme Council of the Armed Forces (Scaf) - headed by Field Marshal Tantawi, has been under pressure to bring forward the election date to May.
They are worried that France's government, under pressure from the European Court of Justice, may repeal a French law obliging owners of small pieces of land to let field-sportsmen on to their property.
Samuels immediately took the new ball but Bravo, whose decision-making in the absence of skipper Chris Gayle has been far from impressive, failed to construct a field conducive to maintaining the pressure and Prince swiftly went on to reach his half-ton.
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