This page shows inadequate, improper or bad use of metric system. Enjoy ride provided by human erroneous, ignorance and stupidity.
During metric conversion in UK, the UK Department for Transport claimed that drivers would be “confused” if metric-only signs were permitted. So how many different units are there on this congested sign?
Answer: there are no less than four different units: yards, feet, inches and metres (assuming, of course that “m” has been used correctly to denote “metres” – not “miles”!).
New unit appeared in USA:
First one is a speed limit sign in Blaine (WA, USA), second one is speed limit sign in Point Roberts (WA, USA). These should be so called "metric" signs, with both imperial and SI units. What unit is used? Lets think: "K" stands usually for "Kelvin", "P" is "Peta", "H" is "Henry". So: "Kelvin Peta Henry". I am really curious why they need such strange unit on road sign?
Oh, maybe it should be "km/h"? It is funny how civil servants can't read simple guide how to use SI and especially correct speed unit "km/h" or "km.h-1. No capital "K", no "per", no dots to denote abbreviations.
Metric and customary speed limit sign at the beginning of the exit ramp at Terminal 3 of JFK Airport (Jamaica NY, Queens):
What is the meaning of this sign? Speed limit of 10 MPH next 16 km (if Km means km). Afterwards speed is unlimited, I suppose.
Errors: the symbol for kilometers incorrectly has a capital K, and the division symbol (slash) and hour (h) are missing from the metric side.
The Sankt Erik is an icebreaker and a museum ship attached to the Vasa Museum in Stockholm, Sweden:
My colleges Dominik Pražák and Martin Vičar made a metrological audit of this ship and found following pressure gauges:
There are utilized 5 distinct pressure units on the ship:
And following 2 are used as second scale units:
It means to remember 10 (for some people 20) conversion factors!
Moreover unit kilograms per square centimeter has 9 symbols (omitting kp/cm2):
|KGM. SQ. CM. PRESS.|
|KG. PR. □ CM.|
|KGS. PER SQ. CM.|
- It is obvious why sailors were heavy drinkers.
- No instrument has a valid calibration.
- Swedish metrological institute neglected metrological supervision in this case.
Everyone knows what does unit Km mean. Of course it is the Kelvin metre. The question is, what does following road signs mean?:
The kelvin metre is probably unit of power per thermal conductivity. So this traffic signs tell us that only cars with sufficiently low ratio of power of the engine per thermal conductivity of the engine body can continue otherwise the car would overheat. Usefull when driving into hot places. Yep, seems legit. But what is Kelvin metre per hour on this traffic sign in Malta?:
Error: the symbol for kilometers incorrectly has a capital K, /h or .h-1 missing in speed unit.
Many people know the light-year is not a time unit but a distance unit. This czech road sign was probably created with similar logic:
Error: missing /h or .h-1 after km to express unit of speed correctly.
This one was hard. What is kilogram times second? You can see it on stepladders, or transport boxes:
Surprisingly, there is an interesting discussion about meaning of kg·s on physics.stackexchange.com. My favorite explanation is the kg·s represents the lifetime of a particle. So one could say the stepladder has lifetime 150 kg·s.
Error: extra s. Kilogram is always kg, independently on plural or singular form.
This is a result of "professionals", Timing
under a supervision of another "professionals" Guinness World
Records. There was an
attempt to make a world speed
record with a lawn mower, and this is an official
(Click image for larger one.)
What is incorrect? kph, this is unfortunately common,
see previous posts.
- Values of time measurements do not have uncertainties.
- There is not specified how the event (start/stop) was detected or any notion of a detector, only type of timer is present.
- Difference of End Time and Start Time has more digits than measured times itself.
- Uncertainty of the result is missing.
- Row of table says "Time", but there is speed in second and third column.
The article at Guinness World Records web page is also full of bad SI. Missing spaces between value and unit, incorrect rounding (116.575 to 116), crazy units (bhp), bad units (kgm). One would expect the company literally based on measurement would know how to present results.)
One have to say this is correct, the LED lamp has
a consumption of 5 kilowatt hours in 1000 hours. But it is so
easier to just write 5 W (5000/1000) and remove unnecessary
hours. Strangely, it is correctly presented on other side of
The problem of missing spaces between values and units is also a common one.
My favorite obfuscation unit is: Mm/ms - Megameter times
Speed of light is 0.3 Mm/ms.