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instant

In physics and the philosophy of science, instant refers to an infinitesimal interval in time, whose passage is instantaneous. In ordinary speech, an instant has been defined as "a point or very short space of time," a notion deriving from its etymological source, the Latin verb instare, from in- + stare ('to stand'), meaning 'to stand upon or near.'The continuous nature of time and its infinite divisibility was addressed by Aristotle in his Physics, where he wrote on Zeno's paradoxes. The philosopher and mathematician Bertrand Russell was still seeking to define the exact nature of an instant thousands of years later.In physics, a theoretical lower-bound unit of time called the Planck time has been proposed, that being the time required for light to travel a distance of 1 Planck length. The Planck time is theorized to be the smallest time measurement that will ever be possible, roughly 10−43 seconds. Within the framework of the laws of physics as they are understood their lifetime, for times less than two Planck time apart, one can neither measure nor detect any change. It is therefore physically impossible, with current technology, to determine if any action exists that causes a reaction in "an instant", rather than reoccurring after an interval of time too short to observe or measure.
As of October 2020, the smallest time interval certify in regulated measurements is on the order of 397 zeptoseconds (397 × 10−21 seconds).

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  1. W

    Baxi instant 80 HE

    Been called out to this boiler,on way home, the customer has noticed the boiler firing up and going off,it's working no fault lights on, to me it looks like it's not modulating,I only gave it the once over,I'm going back tomorrow for a proper look,just looking for any heads ups,or pointers. did...
  2. quality

    baxi instant 105e

    Hi guys I looked at the above boiler this morning with a reported intermittent hot water issue. It all seemed OK when I tried it but the customer said sometime it fires sometimes it doesn't. Any suggestions
  3. R

    baxi instant

    105e, turn on, pump runs, h/w light illuminates (no taps open) fan twitches. h/w and 50 (fan) neons flash=nothing. changed all sensors or jumped them, aps, venturi clear and div motor swapped out. i got it fired up twice in an hour and that was it (when i swapped the div valve over). no 240v to...
  4. B

    Baxi 80he instant

    Did gas cert on this yesterday. 2,8m horizontal flue. It gas rated ok and flame was good. Put analyser in and off the scale So put in air test point and products of combustion picked up. Found boiler flue elbow seal pushed right into elbow not sealing fitted it as it should be and got aps...
  5. finchy01

    Power tripping when dhw/ch demand.

    Evening all, I had a call back today from a month ago or so. The power trips when a) immediate demand for dhw and b) a few seconds after demand for ch. We replaced the programmer, cylinder stat and 3 port before (a different reason). This has only started a couple of days ago so I know it's...
  6. A

    Baxi combi instant 105e hot water problems

    I have a problem with my boiler. Hot water would not switch on unless I switch off and than back on the boiler. At first the hot water would not switch on in the kitchen but was working perfectly upstairs in the bathroom, even without switching boiler off first, now it wouldn't always switch on...
  7. B

    Anyone reccomend an instant inline water heater?

    Hello, So the situation is as follows, The building has a pumped hot water circulating loop. The system is vented. At the very end of the loop where the pipe work turns round to go back the way it came it tees off into 15mm and goes to a hand basin tap in a shower room. The length of this leg...
  8. H

    Baxi instant 80 he

    No hot water unless I turn preheat switch off then back on sometimes 5/6 times for a bath?
  9. B

    Baxi Instant 80HE

    The above boiler. Having problem with condense. Every so often the boiler will just gush out about a litre of condense from the trap. Resulting in it shorting the contracts and going to lock out. One engineer thought the secondary heat exchanger was passing , so that's been replaced, the black...
  10. P

    Baxi 80 instant he

    Hi guys got one with a flat failed ex vessel was going to change it but it's a pig of a job two outlets. So was thinking a external one. Do I cut into the heating 22mm pipe and put in a tee hang the new one ect just leave the old one behind boiler help please many thanks Pete
  11. K

    Hi all... instant hot water?

    Hi, I've just joined the forum and thought I'd introduce myself with bit of background about my abilities and a brief insight into my project together with my question regarding instant hot water circuits. I ran my own commercial interiors company (office fit-outs and hospital refurbs mostly)...
  12. P

    Baxi 80e instant combi overheating

    Hi, just after abit of advice really, customer of mine has recently put heating on for first time this yr and boiler keeps faulting out overheating, hot water is working fine it's just when in heating mode heat doesn't seem to be circulating away from boiler - changed pump but still have the...
  13. G

    Baxi 105e Instant Combi " Hot Water Downstairs taking forever to come through"

    Hi Guys I have a Baxi 105e Instant Combi Boiler its a bit like Triggers Broom i have changed almost every part. when using hot water downstairs it takes forever to heat up, no problems upstairs. when water downstairs eventually gets hot it dosnt last and will run through cold and...
  14. B

    Instant hot water - HELP NEEDED!

    Hiya guys and girls.. just a quick intro, my names Nick I've been a domestic plumber for around 6/7yrs, mainly bathroom installation and plumbing maintenance for letting agencies and domestic clients.. ive be joined up because I've had a promising opportunity from an experienced property...
  15. E

    Baxi 105e instant

    Help with hot water The boiler fires up for water demand doesn't heat up all the temp lights come on and goes in to overheat, cools then cycles on again but no heat transfer to the DHW it has a new diverter valve supplied by customer fitted by me I have cleaned out the plate heat exchanger, the...
  16. E

    Baxi 105e instant

    Help with hot water The boiler fires up for water demand doesn't heat up all the temp lights come on and goes in to overheat, cools then cycles on again but no heat transfer to the DHW it has a new diverter valve supplied by customer fitted by me I have cleaned out the plate heat exchanger, the...
  17. B

    Instant 105e Upstairs rads get hot when preheat turned on

    Also system pressure loss (PRV leaking). Been twice before to recharge PV. Are the two issues linked or do we have two separate problems? I suspect div valve passing when DHW on preheat. Can anyone tell me which seal will need replacing?
  18. M

    Baxi 105e instant problems

    Went out to look at a 105e instant earlier, Im normaly ok on these, I rather like them. However, this one whe I arrived had the fan light flashing, reset it and it fired up, fan was pulsating very erratically, and the flame was going up and down. I checked the voltage at the fan ad was getting...
  19. M

    BAXI 105e Instant hot water getting colder as demand goes up

    HI I have a baxi 105e instant, if i open the Hot water type slightly i can get continuous very hot water but if i demand more flow (ie open the hot water tap more) the temperature decreases. I have checked and changed both the DHW and divertor valve diaphrams (both seemed ok) Thanks
  20. I

    Baxi 105e instant combi- intermittant DHW

    This old chestnut again by the looks of it, customer complains of intermittent hot water so i called Baxi and they recommended a new DHW sensor. I ordered one up, and finally got it to see/change it(they work during the day so it's another night time only visit :( ). Fired it up and it seemed...
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