{"id":5015,"date":"2025-11-27T15:03:17","date_gmt":"2025-11-27T14:03:17","guid":{"rendered":"https:\/\/www.drwiesner.de\/glossary\/boyle-mariotte-2\/"},"modified":"2026-01-12T11:56:33","modified_gmt":"2026-01-12T10:56:33","slug":"boyle-mariotte-2","status":"publish","type":"glossary","link":"https:\/\/www.drwiesner.de\/en\/glossary\/boyle-mariotte-2\/","title":{"rendered":"Boyle-Mariotte law"},"content":{"rendered":"
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The Boyle-Mariotte Law<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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The Boyle-Mariotte Law, also known as Boyle’s Law, states that the pressure of ideal gases is inversely proportional to their volume at constant temperature and amount of substance. If the pressure on a gas volume is increased, its volume is reduced by the increased pressure. If the pressure is reduced, it expands. <\/p>

<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Mathematically, Boyle’s Law is expressed by the formula:
(Approximate formula without considering temperature)<\/em><\/p>

p • V = constant<\/p>

therefore<\/p>

p₁ • V₁ = p₂ • V₂<\/p>

or<\/p>

p₁\/p₂ = V₂\/ V₁<\/p>

where<\/p>

p₁: initial pressure<\/p>

V₁: initial volume<\/p>

p₂: final pressure<\/p>

V₂: final volume<\/p>

You can learn how this effect can be used to convert the pressure change in a leak test to the leak rate<\/p>

Based on the above, the formula for converting flow \/ pressure change is derived:
(without considering temperature):<\/p>

pstart<\/sub> • Vstart<\/sub> = pend<\/sub> • Vend<\/sub> + pleak<\/sub> • Vleak<\/sub><\/p>

Since Vstart<\/sub> = Vend<\/sub> = VDUT<\/sub> + VSystem<\/sub> = VTest<\/sub>
and pleak<\/sub> = 1 bar (ambient pressure), it follows:<\/p>

VTest<\/sub> • (pstart<\/sub> – pend<\/sub>) = Vleak<\/sub> • 1 bar<\/p>

⇒ Vleak<\/sub> = (VTest<\/sub> • Δp) \/ 1 bar<\/p>

<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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Normalization to flow rate (with test time):<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t
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In summary, how this effect can be used to convert the pressure change in a leak test to the leak rate is explained >here<.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

\"image_pdf\"Download<\/span><\/a>\"image_print\"Drucken<\/span><\/a><\/div>","protected":false},"excerpt":{"rendered":"

The Boyle-Mariotte Law The Boyle-Mariotte Law, also known as Boyle’s Law, states that the pressure of ideal gases is inversely proportional to their volume at constant temperature and amount of substance. If the pressure on a gas volume is increased, its volume is reduced by the increased pressure. If the pressure is reduced, it expands. 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If the pressure on a gas volume is increased, its volume is reduced by the increased pressure. If the pressure is reduced, it expands. 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