dispense misura temperatura
DESCRIPTION
fisica tecnicaTRANSCRIPT
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Legge dei gas
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Dove e quando
• 6 turni, venerdì ma5na e pomeriggio • 15/03, 22/03, 05/04 • 9:30 -‐ 12:30 e 14:30 -‐ 17:30 • Laboratorio di Meccanica e Termodinamica, Povo 1
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Iscrizioni • cliccare su hKp://dida5caonline.unitn.it/dol/ • cliccare, nella sezione Ingegneria, su “Fisica Tecnica -‐ Grigiante”
• nella schermata di autenQcazione, cliccare su LOGIN UNITN
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• verrà chiesta (solo al primo accesso) una parola chiave: fisicatecnica2013
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Legge dei gas
• Gas ideale:
• Vale per gas rarefa5
P ⋅V = n ⋅R ⋅TPressione
Volume
Temperatura Numero di moli Costante
dei gas
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Legge dei gas
• Dipendenza dalla temperatura:
• Volume e numero di moli: costante
P = n ⋅RV
⋅ θ −θ0( ) = β ⋅θ +α
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Apparato: manometro ad acqua
Ramo libero
Acqua
Gas
Dislivello
Bagno termico a temperatura θ
Δh
P0
P
Ramo fisso
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Apparato: manometro ad acqua
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Apparato: manometro ad acqua
![Page 9: Dispense Misura Temperatura](https://reader034.vdocuments.mx/reader034/viewer/2022042615/55cf927d550346f57b96c81f/html5/thumbnails/9.jpg)
Apparato: manometro ad acqua
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Apparato: manometro ad acqua
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Apparato: sQma della pressione
P = P0 + ρ ⋅g ⋅ Δh
Pressione atmosferica Pressione della colonna d’acqua
ρ = 1 kgdm3 Assunte costanQ
(senza indeterminazione)
g = 9.807 ms2
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Misure: dislivello Temperatura Dislivello
θ Δh δΔh
δh0,1 =Δx12
Δh = h1 − h0
δΔh = δh12 +δh0
2 = 2 Δx12
= Δx6
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Misure: pressione Temperatura Pressione
θ P δP
P = P0 + ρ ⋅g ⋅ Δh
∂P∂P0
= 1
∂P∂Δh
= ρ ⋅g
δP = δP02 + ρ2 ⋅g2 ⋅ δΔh( )2 =
= δP02 + ρ2 ⋅g2 ⋅ Δx
6⎛⎝⎜
⎞⎠⎟
2
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SQma dello zero assoluto
P = P0 + ρ ⋅g ⋅ Δh =α + β ⋅θ
θ0 =−αβ
Temperatura Celsius dello zero assoluto
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Apparato: termometro Risoluzione:
Δθ = 0.01 °C
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Precauzioni
• Apparato delicato • Non deve entrare acqua nella bo5glia
• Niente bolle nell’ansa del manometro
• La tenuta dei tubi è criQca