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How Much Gold is in a Gold Medal?

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On our last semi-regular "Ask Matt" day, reader Mel asked, “Are there standards for just how much gold is in those gold medals these Olympic athletes are getting?”

The amount of gold in medals is indeed regulated, and there’s a lot less than there used to be.

The prizes awarded at the Olympics have varied over their long history. Ancient Greek competitors were given an olive branch from a wild olive tree that grew at Olympia (and some drachma upon returning home a champion, too). When the first modern Olympic games organized by the International Olympic Committee were held in 1896 in Athens, winners got a silver medal and an olive branch, and runners-up received a bronze medal and a laurel branch.

At the 1900 Paris Games, some athletes got silver or bronze medals, but the majority received cups or other trophies. Gold medals made from solid gold were introduced at the 1904 St. Louis Games, and four years later in London, the medals began to be awarded to the top three placing athletes in the gold-silver-bronze order we’re familiar with today.

The 1912 Stockholm Games were the last time solid gold medals were awarded. These days, the IOC charter only requires that the first place medals be silver gilt, containing “silver of at least 925-1000 grade and gilded with at least 6g of pure gold.” The second place silver medals must contain silver of a similar grade. Beyond that, the specific composition of the medals, and their design, is largely left to the host city’s organizing committee.

Going for (1%) Gold

For this year’s London Games, the gold medals are roughly 93% silver, 6% copper and 1% gold (as of this writing, that’s about $300 worth of gold). The silver medals are 92% silver and 8% copper. The bronze medals are 97% copper, 2.5% zinc and 0.5% tin.

The medals have a value beyond the worth of their precious metal content, though. They’re pieces of history, and can command high asking prices on the market. A gold medal from the 1980 "Miracle on Ice" American hockey team was auctioned off for over $300,000 a few years ago, and a bronze medal from the 1972 Munich Games recently sold for just shy of $3,000.

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A story from ancient Greece, back when athletes received only a humble olive branch, says a lot about what these prizes mean. In The Histories, Herodotus writes about a group of Arcadian deserters who went to the Persians looking for work. The Persians asked them what the Greeks were up to, and the Arcadians explained that their countrymen were “holding the Olympic festival and viewing sports and horse races.” The Persians asked what prizes were offered to the competitors and the Arcadians explained that the victors received a “crown of olive.”

“Then Tigranes son of Artabanus [a Persian regent] uttered a most noble saying,” writes Herodotus. “When he heard that the prize was not money but a crown, he could not hold his peace, but cried, ‘Good heavens, Mardonius [a Persian military commander], what kind of men are these that you have pitted us against? It is not for money they contend but for glory of achievement!’”

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Big Questions
Where Is the Hottest Place on Earth?
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The summer of 2017 will go down as an endurance test of sorts for the people of Phoenix, Arizona. The National Weather Service issued an extreme heat warning, and planes were grounded as a result of temperatures exceeding 120 degrees. (Heat affects air density, which in turn affects a plane’s lift.)

Despite those dire measures, Phoenix is not the hottest place on Earth. And it’s not even close.

That dubious honor was bestowed on the Lut Desert in Iran in 2005, when land temperatures were recorded at a staggering 159.3 degrees Fahrenheit. The remote area was off the grid—literally—for many years until satellites began to measure temperatures in areas that were either not well trafficked on foot or not measured with the proper instruments. Lut also measured record temperatures in 2004, 2006, 2007, and 2009.

Before satellites registered Lut as a contender, one of the hottest areas on Earth was thought to be El Azizia, Libya, where a 1922 measurement of 136 degrees stood as a record for decades. (Winds blowing from the nearby Sahara Desert contributed to the oppressive heat.)

While the World Meteorological Organization (WMO) acknowledged this reading as the hottest on record for years, they later declared that instrumentation problems and other concerns led to new doubts about the accuracy.

Naturally, declaring the hottest place on Earth might be about more than just a single isolated reading. If it’s consistency we’re after, then the appropriately-named Death Valley in California, where temperatures are consistently 90 degrees or above for roughly half the year and at least 100 degrees for 140 days annually, has to be a contender. A blistering temperature of 134 degrees was recorded there in 1913.

Both Death Valley and Libya were measured using air temperature readings, while Lut was taken from a land reading, making all three pretty valid contenders. These are not urban areas, and paving the hottest place on Earth with sidewalks would be a very, very bad idea. Temperatures as low as 95 degrees can cause blacktop and pavement to reach skin-scorching temperatures of 141 degrees.

There are always additional factors to consider beyond a temperature number, however. In 2015, Bandar Mahshahr in Iran recorded temperatures of 115 degrees but a heat index—what it feels like outside when accounting for significant humidity—of an astounding 163 degrees. That thought might be one of the few things able to cool Phoenix residents off.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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Big Questions
How Does Autopilot Work on an Airplane?
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How does autopilot work on an airplane?

Joe Shelton:

David Micklewhyte’s answer is a good one. There are essentially a few types of features that different autopilots have. Some autopilots only have some of these features, while the more powerful autopilots do it all.

  • Heading Hold: There’s a small indicator that the pilot can set on the desired heading and the airplane will fly that heading. This feature doesn’t take the need for wind correction to desired routing into account; that’s left to the pilot.
  • Heading and Navigation: In addition to holding a heading, this version will take an electronic navigation input (e.g. GPS or VOR) and will follow (fly) that navigation reference. It’s sort of like an automated car in that it follows the navigator’s input and the pilot monitors.
  • Altitude Hold: Again, in addition to the above, a desired altitude can be set and the aircraft will fly at that altitude. Some autopilots have the capability for the pilot to select a desired altitude and a climb or descent rate and the aircraft will automatically climb or descend to that altitude and then hold the altitude.
  • Instrument Approaches: Autopilots with this capability will fly preprogrammed instrument approaches to the point where the pilot either takes control and lands or has the autopilot execute a missed approach.

The autopilot is a powerful computer that takes input from either the pilot or a navigation device and essentially does what it is told to do. GPS navigators, for example, can have a full flight plan entered from departure to destination, and the autopilot will follow the navigator’s guidance.

These are the majority of the controls on the autopilot installed in my airplane:

HDG Knob = Heading knob (Used to set the desired heading)

AP = Autopilot (Pressing this turns the autopilot on)

FD = Flight Director (A form of navigational display that the pilot uses)

HDG = Heading (Tells the autopilot to fly the heading set by the Heading Knob)

NAV = Tells the autopilot to follow the input from the selected navigator

APR = Tells the autopilot to fly the chosen approach

ALT = Tells the autopilot to manage the altitude, controlled by the following:

VS = Vertical Speed (Tells the autopilot to climb or descend at the chosen rate)

Nose UP / Nose DN = Sets the climb/descent rate in feet per minute

FLC = Flight Level Change (An easy manual way to set the autopilot)

ALT Knob = Used to enter the desired altitude

This post originally appeared on Quora. Click here to view.

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