The Pascal, named after the French mathematician and physicist Blaise Pascal, is the SI unit of pressure. It is equivalent to one newton per square meter, symbolized as Pa. Despite its relatively recent introduction in 1971, the Pascal honors the pioneering work of Pascal in fluid mechanics and pressure, such as Pascal’s Law, which explains how pressure applied to a confined fluid is transmitted undiminished in all directions. Interestingly, a single Pascal is a tiny unit of pressure, roughly equal to the pressure exerted by a dollar bill resting flat on a table. This illustrates why everyday atmospheric pressure is typically measured in kilopascals (kPa), as one standard atmosphere is about 101.3 kPa.
A “meter of water @ 4°C” is a unique unit used primarily to measure pressure. At this specific temperature, water reaches its maximum density, and the pressure exerted by a one-meter column of water is approximately 9.81 kilopascals or 0.0979 atmospheres. This scenario represents the optimal conditions for standardizing pressure measurements because the physical properties of water are most stable, reducing variances in calculations.
This unit is especially important in fields like plumbing and hydraulics, where accurate pressure measurements are crucial. Understanding these principles can lead to better designs in water distribution systems, preventing common issues such as pipe bursts or inefficient water flow, ensuring systems operate safely and efficiently.
Pascals | Meters of water @ 4°C |
---|---|
0
Pa
|
0
mH₂O
|
1000
Pa
|
0.101972
mH₂O
|
2000
Pa
|
0.203943
mH₂O
|
3000
Pa
|
0.305915
mH₂O
|
4000
Pa
|
0.407886
mH₂O
|
5000
Pa
|
0.509858
mH₂O
|
6000
Pa
|
0.61183
mH₂O
|
7000
Pa
|
0.713801
mH₂O
|
8000
Pa
|
0.815773
mH₂O
|
9000
Pa
|
0.917745
mH₂O
|
10000
Pa
|
1.01972
mH₂O
|
11000
Pa
|
1.12169
mH₂O
|
12000
Pa
|
1.22366
mH₂O
|
13000
Pa
|
1.32563
mH₂O
|
14000
Pa
|
1.4276
mH₂O
|
15000
Pa
|
1.52957
mH₂O
|
16000
Pa
|
1.63155
mH₂O
|
17000
Pa
|
1.73352
mH₂O
|
18000
Pa
|
1.83549
mH₂O
|
19000
Pa
|
1.93746
mH₂O
|
20000
Pa
|
2.03943
mH₂O
|
21000
Pa
|
2.1414
mH₂O
|
22000
Pa
|
2.24338
mH₂O
|
23000
Pa
|
2.34535
mH₂O
|
24000
Pa
|
2.44732
mH₂O
|
25000
Pa
|
2.54929
mH₂O
|
26000
Pa
|
2.65126
mH₂O
|
27000
Pa
|
2.75323
mH₂O
|
28000
Pa
|
2.85521
mH₂O
|
29000
Pa
|
2.95718
mH₂O
|
30000
Pa
|
3.05915
mH₂O
|
31000
Pa
|
3.16112
mH₂O
|
32000
Pa
|
3.26309
mH₂O
|
33000
Pa
|
3.36506
mH₂O
|
34000
Pa
|
3.46704
mH₂O
|
35000
Pa
|
3.56901
mH₂O
|
36000
Pa
|
3.67098
mH₂O
|
37000
Pa
|
3.77295
mH₂O
|
38000
Pa
|
3.87492
mH₂O
|
39000
Pa
|
3.97689
mH₂O
|
40000
Pa
|
4.07886
mH₂O
|
41000
Pa
|
4.18084
mH₂O
|
42000
Pa
|
4.28281
mH₂O
|
43000
Pa
|
4.38478
mH₂O
|
44000
Pa
|
4.48675
mH₂O
|
45000
Pa
|
4.58872
mH₂O
|
46000
Pa
|
4.69069
mH₂O
|
47000
Pa
|
4.79267
mH₂O
|
48000
Pa
|
4.89464
mH₂O
|
49000
Pa
|
4.99661
mH₂O
|
50000
Pa
|
5.09858
mH₂O
|
51000
Pa
|
5.20055
mH₂O
|
52000
Pa
|
5.30252
mH₂O
|
53000
Pa
|
5.4045
mH₂O
|
54000
Pa
|
5.50647
mH₂O
|
55000
Pa
|
5.60844
mH₂O
|
56000
Pa
|
5.71041
mH₂O
|
57000
Pa
|
5.81238
mH₂O
|
58000
Pa
|
5.91435
mH₂O
|
59000
Pa
|
6.01633
mH₂O
|
60000
Pa
|
6.1183
mH₂O
|
61000
Pa
|
6.22027
mH₂O
|
62000
Pa
|
6.32224
mH₂O
|
63000
Pa
|
6.42421
mH₂O
|
64000
Pa
|
6.52618
mH₂O
|
65000
Pa
|
6.62816
mH₂O
|
66000
Pa
|
6.73013
mH₂O
|
67000
Pa
|
6.8321
mH₂O
|
68000
Pa
|
6.93407
mH₂O
|
69000
Pa
|
7.03604
mH₂O
|
70000
Pa
|
7.13801
mH₂O
|
71000
Pa
|
7.23999
mH₂O
|
72000
Pa
|
7.34196
mH₂O
|
73000
Pa
|
7.44393
mH₂O
|
74000
Pa
|
7.5459
mH₂O
|
75000
Pa
|
7.64787
mH₂O
|
76000
Pa
|
7.74984
mH₂O
|
77000
Pa
|
7.85181
mH₂O
|
78000
Pa
|
7.95379
mH₂O
|
79000
Pa
|
8.05576
mH₂O
|
80000
Pa
|
8.15773
mH₂O
|
81000
Pa
|
8.2597
mH₂O
|
82000
Pa
|
8.36167
mH₂O
|
83000
Pa
|
8.46364
mH₂O
|
84000
Pa
|
8.56562
mH₂O
|
85000
Pa
|
8.66759
mH₂O
|
86000
Pa
|
8.76956
mH₂O
|
87000
Pa
|
8.87153
mH₂O
|
88000
Pa
|
8.9735
mH₂O
|
89000
Pa
|
9.07547
mH₂O
|
90000
Pa
|
9.17745
mH₂O
|
91000
Pa
|
9.27942
mH₂O
|
92000
Pa
|
9.38139
mH₂O
|
93000
Pa
|
9.48336
mH₂O
|
94000
Pa
|
9.58533
mH₂O
|
95000
Pa
|
9.6873
mH₂O
|
96000
Pa
|
9.78928
mH₂O
|
97000
Pa
|
9.89125
mH₂O
|
98000
Pa
|
9.99322
mH₂O
|
99000
Pa
|
10.09519
mH₂O
|
100000
Pa
|
10.19716
mH₂O
|
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