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Chương 2: thông số vật lý
thực phẩm
Caùc thoâng soá vaät lyù cuûa thöïc phaåm
•
•
•
•
•
•
•
Ñoä daøi
: L (m)
Dieän tích : S (m2)
Theå tích
: V (m3)
Khoái löôïng : m (kg)
Khoái löôïng rieâng: ρ (kg/m3)
AÙp suaát
: P (N/m2)
Vaän toác
: v (m/s)
Caùc thoâng soá vaät lyù cuûa
thöïc phaåm (tt)
•
•
•
•
•
•
Ñoä nhôùt
: µ (Ns/m2)
Nhieät löôïng rieâng : i, I (J/kg)
Nhieät dung rieâng : c (J/kg.ñoä)
Heä soá daãn nhieät : λ (W/m.ñoä)
Heä soá truyeàn nhieät
: k (W/m2.ñoä)
Nhieät ñoä
: T (ñoä C, ñoä F, ñoä
K)
Dimensions
(Thöù
nguyeân)
Dimensions are represented as symbols
(kyù hieäu) by:
• length [L],
• mass [M],
• time [t],
• temperature [T]
• force [F].
All engineering quantities can be expressed in terms of these
fundamental dimensions
Dimension
s
(Thöù nguyeân)
• Length = [L], area = [L]2 , volume = [L]3.
• Velocity = length travelled per unit
time=[L]/[t]
• Acceleration = rate of change of
velocity=[L]/[t]x1/[t]=[L]/[t][t]=[L]/ [t]2
• Pressure
= force per unit area=[F]/[L]2
• Density
= mass per unit volume=[M]/[L]3
• Energy
= force times length=[F] x [L].
• Power
= energy per unit time=[F] x [L]/[t]
nguon tai.lieu . vn
thực phẩm
Caùc thoâng soá vaät lyù cuûa thöïc phaåm
•
•
•
•
•
•
•
Ñoä daøi
: L (m)
Dieän tích : S (m2)
Theå tích
: V (m3)
Khoái löôïng : m (kg)
Khoái löôïng rieâng: ρ (kg/m3)
AÙp suaát
: P (N/m2)
Vaän toác
: v (m/s)
Caùc thoâng soá vaät lyù cuûa
thöïc phaåm (tt)
•
•
•
•
•
•
Ñoä nhôùt
: µ (Ns/m2)
Nhieät löôïng rieâng : i, I (J/kg)
Nhieät dung rieâng : c (J/kg.ñoä)
Heä soá daãn nhieät : λ (W/m.ñoä)
Heä soá truyeàn nhieät
: k (W/m2.ñoä)
Nhieät ñoä
: T (ñoä C, ñoä F, ñoä
K)
Dimensions
(Thöù
nguyeân)
Dimensions are represented as symbols
(kyù hieäu) by:
• length [L],
• mass [M],
• time [t],
• temperature [T]
• force [F].
All engineering quantities can be expressed in terms of these
fundamental dimensions
Dimension
s
(Thöù nguyeân)
• Length = [L], area = [L]2 , volume = [L]3.
• Velocity = length travelled per unit
time=[L]/[t]
• Acceleration = rate of change of
velocity=[L]/[t]x1/[t]=[L]/[t][t]=[L]/ [t]2
• Pressure
= force per unit area=[F]/[L]2
• Density
= mass per unit volume=[M]/[L]3
• Energy
= force times length=[F] x [L].
• Power
= energy per unit time=[F] x [L]/[t]