Gallon per minute (GPM) is a crucial unit in measuring flow rate, especially in the context of plumbing, irrigation, and various industrial applications. Originally rooted in the British Imperial system, the gallon has a rich history with variations across countries—such as the US liquid gallon, which is approximately 3.785 liters, and the UK gallon, which is around 4.546 liters. This means that when considering flow rates, the distinction between these gallons can lead to significant differences in calculation and application.
What’s particularly fascinating about GPM is its pivotal role in modern sustainability efforts. For example, showerheads in the United States are often rated by their GPM to help reduce water usage and promote conservation. Low-flow fixtures, which typically limit water flow to 2.5 GPM or less, have become a standard in reducing both water waste and energy costs, highlighting the intersection of environmental responsibility and engineering.
The pint per hour is a lesser-known unit of flow rate that finds its charm in the world of brewing and small-scale liquid distribution. Primarily used in the United States and the UK, a pint per hour measures how much liquid—specifically a pint—flows per hour, making it essential for brewers ensuring the precision of their craft. While breweries heavily rely on precise measurements to maintain flavor, texture, and quality, the pint per hour unit also interestingly comes into play in household systems like drip irrigation, where the gentle trickle ensures plants receive consistent hydration.
Even in historical contexts, the pint per hour has its fascinating roots. It was used by alewives in medieval Europe, who measured using much more rudimentary, time-tested methods. Through innovation and tradition alike, the pint per hour illustrates the quaint yet crucial role of accurate measurement in everyday life.
Gallons per minute | Pints per hour |
---|---|
0
gal/min
|
0
pnt/h
|
10
gal/min
|
4800
pnt/h
|
20
gal/min
|
9600
pnt/h
|
30
gal/min
|
14400
pnt/h
|
40
gal/min
|
19200
pnt/h
|
50
gal/min
|
24000
pnt/h
|
60
gal/min
|
28800
pnt/h
|
70
gal/min
|
33600
pnt/h
|
80
gal/min
|
38400
pnt/h
|
90
gal/min
|
43200
pnt/h
|
100
gal/min
|
48000
pnt/h
|
110
gal/min
|
52800
pnt/h
|
120
gal/min
|
57600
pnt/h
|
130
gal/min
|
62400
pnt/h
|
140
gal/min
|
67200
pnt/h
|
150
gal/min
|
72000
pnt/h
|
160
gal/min
|
76800
pnt/h
|
170
gal/min
|
81600
pnt/h
|
180
gal/min
|
86400
pnt/h
|
190
gal/min
|
91200
pnt/h
|
200
gal/min
|
96000
pnt/h
|
210
gal/min
|
100800
pnt/h
|
220
gal/min
|
105600
pnt/h
|
230
gal/min
|
110400
pnt/h
|
240
gal/min
|
115200
pnt/h
|
250
gal/min
|
120000
pnt/h
|
260
gal/min
|
124800
pnt/h
|
270
gal/min
|
129600
pnt/h
|
280
gal/min
|
134400
pnt/h
|
290
gal/min
|
139200
pnt/h
|
300
gal/min
|
144000
pnt/h
|
310
gal/min
|
148800
pnt/h
|
320
gal/min
|
153600
pnt/h
|
330
gal/min
|
158400
pnt/h
|
340
gal/min
|
163200
pnt/h
|
350
gal/min
|
168000
pnt/h
|
360
gal/min
|
172800
pnt/h
|
370
gal/min
|
177600
pnt/h
|
380
gal/min
|
182400
pnt/h
|
390
gal/min
|
187200
pnt/h
|
400
gal/min
|
192000
pnt/h
|
410
gal/min
|
196800
pnt/h
|
420
gal/min
|
201600
pnt/h
|
430
gal/min
|
206400
pnt/h
|
440
gal/min
|
211200
pnt/h
|
450
gal/min
|
216000
pnt/h
|
460
gal/min
|
220800
pnt/h
|
470
gal/min
|
225600
pnt/h
|
480
gal/min
|
230400
pnt/h
|
490
gal/min
|
235200
pnt/h
|
500
gal/min
|
240000
pnt/h
|
510
gal/min
|
244800
pnt/h
|
520
gal/min
|
249600
pnt/h
|
530
gal/min
|
254400
pnt/h
|
540
gal/min
|
259200
pnt/h
|
550
gal/min
|
264000
pnt/h
|
560
gal/min
|
268800
pnt/h
|
570
gal/min
|
273600
pnt/h
|
580
gal/min
|
278400
pnt/h
|
590
gal/min
|
283200
pnt/h
|
600
gal/min
|
288000
pnt/h
|
610
gal/min
|
292800
pnt/h
|
620
gal/min
|
297600
pnt/h
|
630
gal/min
|
302400
pnt/h
|
640
gal/min
|
307200
pnt/h
|
650
gal/min
|
312000
pnt/h
|
660
gal/min
|
316800
pnt/h
|
670
gal/min
|
321600
pnt/h
|
680
gal/min
|
326400
pnt/h
|
690
gal/min
|
331200
pnt/h
|
700
gal/min
|
336000
pnt/h
|
710
gal/min
|
340800
pnt/h
|
720
gal/min
|
345600
pnt/h
|
730
gal/min
|
350400
pnt/h
|
740
gal/min
|
355200
pnt/h
|
750
gal/min
|
360000
pnt/h
|
760
gal/min
|
364800
pnt/h
|
770
gal/min
|
369600
pnt/h
|
780
gal/min
|
374400
pnt/h
|
790
gal/min
|
379200
pnt/h
|
800
gal/min
|
384000
pnt/h
|
810
gal/min
|
388800
pnt/h
|
820
gal/min
|
393600
pnt/h
|
830
gal/min
|
398400
pnt/h
|
840
gal/min
|
403200
pnt/h
|
850
gal/min
|
408000
pnt/h
|
860
gal/min
|
412800
pnt/h
|
870
gal/min
|
417600
pnt/h
|
880
gal/min
|
422400
pnt/h
|
890
gal/min
|
427200
pnt/h
|
900
gal/min
|
432000
pnt/h
|
910
gal/min
|
436800
pnt/h
|
920
gal/min
|
441600
pnt/h
|
930
gal/min
|
446400
pnt/h
|
940
gal/min
|
451200
pnt/h
|
950
gal/min
|
456000
pnt/h
|
960
gal/min
|
460800
pnt/h
|
970
gal/min
|
465600
pnt/h
|
980
gal/min
|
470400
pnt/h
|
990
gal/min
|
475200
pnt/h
|
1000
gal/min
|
480000
pnt/h
|
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