真空度單位換算表

1、真空度單位換算表單位PaKPaMPaPsimmHgin.HgmmH20in.H20mbarbarTratmPa10.0010.0000010.000140.00750.000290.102040.004010.010.000010.00750.000009869KPa100010.0010.145037.500610.29528102.047864.01875100.017.500610.009869MPa100000010001145

2、.037257500.61682295.28744102047.8654018.7515410000107500.616829.869Psi6894.780176.894780.00689151.71512.03594703.597627.708468.94780.0689451.71510.06804mmHg133.322360.133320.0001320.0193310.0393613.605260.535781.333220.0

3、013310.00131in.Hg3386.530743.386530.003380.4911725.401061345.5882313.6096233.86530.0338625.401060.03342mmH209.799320.009790.000009790.001420.07350.0028910.039380.097990.000097990.07350.0000967in.H20248.833490.248830.0002

4、48830.036091.86640.0734725.3929212.488330.002481.86640.00245mbar1000.10.00010.01450.750060.0295210.204780.4018710.0010.750060.00098bar1000001000.114.50372750.0616829.5287410204.7865401.8751510001750.061680.98692Tr133.322

5、360.133320.0001320.0193310.0393613.605260.535781.333220.0013310.00131atm101325101.3250.10132514.695976029.9210340407.21013.251.013257601真空表讀數(shù)與真空表讀數(shù)與真空度換算◇真空度用“絕對(duì)真空度絕對(duì)真空度”、“絕對(duì)壓力絕對(duì)壓力”，即比“理論真空理論真空”高多少壓力標(biāo)識(shí)；“絕對(duì)真空度“是指被測(cè)對(duì)象的實(shí)際壓力

6、值。在實(shí)際情況中，真空泵的絕對(duì)壓力值介于0～101.325KPa之間。絕對(duì)壓力值需用絕對(duì)壓力儀表測(cè)量，在20℃，海拔高度=0的地方，用于測(cè)量真空度的儀表(絕對(duì)真空表)的初始值為101325Pa(即一個(gè)標(biāo)準(zhǔn)大氣壓)?！笳婵斩扔谩跋鄬?duì)真空度相對(duì)真空度”、“相對(duì)壓力相對(duì)壓力”，即比“大氣壓大氣壓”低多少壓力來標(biāo)識(shí)；“相對(duì)真空度“是指被測(cè)對(duì)象的壓力與測(cè)量地點(diǎn)大氣壓的差值。用普通真空表可測(cè)量。在沒有真空的狀態(tài)下，表的初始值為0，當(dāng)測(cè)量真空時(shí)，它的

7、值介于0到101325Pa（即0.1MPa)之間。真空表上“0”表示正一個(gè)大氣壓即101325Pa“0.1”表示絕對(duì)真空（即為0）。真空表上的指示值不表示真空度的絕對(duì)值，只表示了真空度的相對(duì)值。◇真空度的絕對(duì)值與相對(duì)值可用下式換算：P≈100000（1－Φ0.1）Pa；Φ為真空表的讀數(shù)示值的絕對(duì)數(shù)?！笳婵毡淼淖x數(shù)示值為0，則P≈100000（100.1）=10000Pa為1個(gè)大氣壓。◇真空表的讀數(shù)示值為0.1，則P≈1100000（10

8、.10.1）=0Pa為絕對(duì)真空?！笳婵毡淼淖x數(shù)示值為0.075，則P≈100000（10.0750.1）=25000Pa?！笳婵毡淼淖x數(shù)示值為0.08，則P≈100000（10.080.1）=20000Pa?！笳婵毡淼淖x數(shù)示值為0.09，則P≈100000（10.090.1）=10000Pa?！笳婵毡淼淖x數(shù)示值為0.095，則P≈100000（10.0950.1）=5000Pa?！笳婵毡淼淖x數(shù)示值為真空表的讀數(shù)示值為0.097，則，則P

9、≈100000（10.0970.1）=3000Pa?？諝饷芏仍谝粋€(gè)標(biāo)準(zhǔn)大氣壓下每立方米空氣所具有的質(zhì)量(千克)就是空氣密度.1.22514.0292.52529.2281.32515.198◇真空表的讀數(shù)示值為685mmHg，則P≈100000（1685760）=10000Pa?！笳婵毡淼淖x數(shù)示值為700mmHg，則P≈100000（1700760）=8000Pa。表1應(yīng)予淘汰的壓力計(jì)量單位和符號(hào)應(yīng)淘汰的壓力單位的名稱單位符號(hào)用法定計(jì)量

10、單位表示的形式值毫巴mb100Pa托tr133.322Pa標(biāo)準(zhǔn)大氣壓atm101325Pa工程大氣壓at98.0665Pa達(dá)因每平方厘米dyncm20.1Pa毫米水柱mmH2O9.80665Pa毫米汞柱mmHg133.322Pa磅力每平方英寸PSIP.S.I6894.7Pa千克力每平方米kgfm29.80665Pa除此之外，應(yīng)該還須指出在真空技術(shù)中另一個(gè)常用的表示氣體流量或密封器件漏率的計(jì)量單位也必須作相應(yīng)的更動(dòng)。所謂氣體流量指的是泵抽