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In everyday use and in kinematics, the speed (commonly referred to as v) of an object is the magnitude of the rate of change of its position with time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.
Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph). For air and marine travel the knot is commonly used.
The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in a vacuum c = 299792458 metres per second (approximately 1079000000 km/h or 671000000 mph). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy. In relativity physics, the concept of rapidity replaces the classical idea of speed.

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  1. J

    I am having difficulty with my kitchen hot tap water speed

    Hi, I am having difficulty with my kitchen hot tap water speed, just recently I replaced an old leaking tap with a new one and ever since doing this the water from the hot tap is very slow, while replacing the tap I turned off the cold water via the main stopcock and turned the boiler off, I...
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  2. M

    speed fit fittings on chrome on copper pipe??

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  3. M

    Broken 2 circulating pumps today!!

    Hey fellers, well this is a bad day for me. Last night, my pump starting screeching. So today i have been going around the house trying to solve the issue. Is it air? Is it the impeller or what? Well. first things first, i back filled the system from the mains, then the pump starting...
  4. P

    Is the pump faulty?

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  5. B

    Gary speed

    Suspected suicide , that's bad rip fella
  6. D

    Grundfos UPS 15-60 Queries

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  7. R

    Some simple questions... if you know the answers?

    Hello all, I've searched the threads and can't find the exact answers to my questions but I may be asking the wrong questions. My pal is having some heating issues. 1. Bottle type air vent. Should the black knurled nut on the top of the vent body be left cracked open or shut tight after...
  8. M

    Using micro-bore to speed up the arrival of hot water at a basin: sensible or not?

    I’ve recently refitted my downstairs shower room. The hot water arrives at the shower via existing 22mm copper from the new pressurised hot water cylinder. There’s also a wash basin teed off from the 22mm copper. Note that the shower is not much used in this room - it’s primarily a guest WC...
  9. H

    whirlpool bath switch

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  10. J

    water coming from vent pipe when heating is turned on help

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  11. U

    Speed cameras

    Anyone driving through Oxfordshire at the moment please be aware that although the speed cameras have been turned off since before christmas, the Police have decided to turn them back on today. yes it is April the 1st No this is not an April fools joke!!!!
  12. O

    am i up to speed????

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  13. P

    speed fit inserts

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  14. M

    grundfos two speed super 4 circulating pump?

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  15. R

    Correct CH pump speed?

    How do I work out the correct speed for my system?
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    • Forum: Plumbing Jobs | The Job-board
  16. M

    Wilo pump speed setting

    Hi All, New to the site and have a question regarding my central heating system. I reacently replaced a 3 year old (5m) terrier water pump that was siezed, with a Wilo (6m) pump. wilo pump part # (wilo-star-rs25/6-130) The question I have is that the Wilo has 3 speed settings and the manual...
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    • Replies: 6
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  17. M

    Pressure testing JG speed with air?

    Basicly testing new install on a extention today when wet pump gave up on me. So got out trusty compressor and dry test kit. And got stuck in only to be gutted when I had a pressure of 3 bar to zero in five mins. So put pressure back in and went about with leak detector spray but to no avail all...
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  18. T

    CH pump - Variable or 3 speed?

    Hi, I’m looking for a central heating pump. It’s for a fairly conventional Y-Plan open vented system, condensing oil boiler, TRV’s (except for 1 rad). DHW. I’ve come across the variable speed Grundfos Alpha 2L. This pump is a bit more expensive than the 3-speed types, but it is supposed to...
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  19. B

    Speed Limit

    This is intended to try and help new Plumbers who are interested in system design and those who are not, to help them realize that there are governing factors in Plumbing. BS 6700 states the fastest velocity you want water to go in a cold water pipe is about 3 meters per second, with a gradual...
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  20. O

    Speed of work!

    hi guys, i was just wondering if working speed is sometimes a problem for you or is it just me, for example, i was doing a bit of pipework on the first fix for a bathroom. simply hot and cold feeds run across wall for shower bog and basin in copper pipe aswell as waste (the walls had already...
    • obseen16
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