BÀI TẬP CƠ LƯU CHẤT CHƯƠNG 4

Conversion table
The internationally accepted unit is the newton-metre (N·m)
1. To convert N·m:
• Newton metres to kilogramme force metres
1 N·m = 0,102 kgf·m
• Newton metres to pound force feet
1 N·m = 0,738 lbf.ft
• Newton metres to pound force inches
1 N·m = 8,851 lbf.in
• Newton metres to ounce force inches
1 N·m = 141,61 ozf.in
2. To convert kgf·m:
• Kilogramme force metres to newton
metres
1 kgf·m = 9,81 N·m
• Kilogramme force metres to pound force
feet
1 kgf·m = 7,23 lbf.ft
• Kilogramme force metres to pound force
inches
1 kgf·m = 86,8 lbf.in
3. To convert lbf f:
• Pound force feet to newton metres
1 lbf.ft = 1,35 N·m
• Pound force feet to kilogramme force metres
1 lbf.ft = 0,138 kgf·m
• Pound force feet to pound force inches
1 lbf.ft = 12 lbf.in
4. To convert lbf.in:
• Pound force inches to newton metres
1 lbf.in = 0,1129 N·m

• Pound force inches to kilogramme force
metres
1 lbf.in = 0,0115 kgf·m
• Pound force inches to pound force feet
1 lbf.in = 0,083 lbf.ft
• Pound force inches to ounce force inches
1 lbf.in = 16 ozf.in
Pressure Units
pascal
(Pa)
bar
(bar)
technical atmosph
ere
(at)
atmosphere
(atm)
torr
(Torr)
pound-force pers
quare inch
(psi)
1 Pa ≡ 1 N/m
2
10
−5
1.0197×10
−5
9.8692×10
−6

7.5006×10
−3
145.04×10
−6
1 bar 100,000 ≡ 10
6
dyn/cm
2
1.0197 0.98692 750.06 14.5037744
1 at 98,066.5 0.980665 ≡ 1 kgf/cm
2
0.96784 735.56 14.223
1 atm 101,325 1.01325 1.0332 ≡ 1 atm 760 14.696
1 torr 133.322 1.3332×10
−3
1.3595×10
−3
1.3158×10
−3
≡ 1 Torr; ≈ 1 mmHg 19.337×10
−3
1 psi 6,894.76 68.948×10
−3
70.307×10
−3
68.046×10
−3
51.715 ≡ 1 lbf/in
2
1 inch = 2,54 centimét

newton
(SI unit)
dyne
kilogram-force,
kilopond
pound-force poundal
1 N ≡ 1 kg·m/s² = 10
5
dyn ≈ 0.10197 kp
≈ 0.22481 lb
f
≈ 7.2330 pdl
1 dyn = 10
−5
N ≡ 1 g·cm/s² ≈ 1.0197×10
−6
kp
≈ 2.2481×10
−6
lb
f
≈ 7.2330×10
−5
pdl
1 kp = 9.80665 N = 980665 dyn
≡ g
n
·(1 kg) ≈ 2.2046 lb
f
≈ 70.932 pdl

1 lb
f
≈ 4.448222 N ≈ 444822 dyn ≈ 0.45359 kp
≡ g
n
·(1 lb)
≈ 32.174 pdl
1 pdl ≈ 0.138255 N ≈ 13825 dyn ≈ 0.014098 kp
≈ 0.031081 lb
f
≡ 1 lb·ft/s²
The value of g
n
as used in the official definition of the kilogram-force is used here for all gravitational units.
Units of force
BÀI TẬP – Động lực học lưu chất
4BT-CLC-Độnglựchoc-Chuong4
5
BT-CLC-Độnglựchoc-Chuong4
6
BT-CLC-Độnglựchoc-Chuong4
7
BT-CLC-Độnglựchoc-Chuong4
8
BT-CLC-Độnglựchoc-Chuong4
BÀI TẬP – Động lực học lưu chất
9
BT-CLC-Độnglựchoc-Chuong4
11BT-CLC-Độnglựchoc-Chuong4

12
BT-CLC-Độnglựchoc-Chuong4
13BT-CLC-Độnglựchoc-Chuong4
14
BT-CLC-Độnglựchoc-Chuong4
15
BT-CLC-Độnglựchoc-Chuong4
16BT-CLC-Độnglựchoc-Chuong4
17
BT-CLC-Độnglựchoc-Chuong4
18
BT-CLC-Độnglựchoc-Chuong4
19BT-CLC-Độnglựchoc-Chuong4
20BT-CLC-Độnglựchoc-Chuong4
21BT-CLC-Độnglựchoc-Chuong4
22BT-CLC-Độnglựchoc-Chuong4
23
BT-CLC-Độnglựchoc-Chuong4
24BT-CLC-Độnglựchoc-Chuong4