How this unit comes like that ?

[manal950]

How this unit comes

R = specific volume X (pressure / Temperature )

0.9m^3/kg (1.3X10^5 N/m^2 / 408 K )

R = 286 KJ/KgK

please can anyone explain to me how the unit ( KJ/KgK ) comes ??

 

[Borek]

kJ/(kg*K) - looks quite straightforward, where is the problem?

 

[manal950]

Hi sir .. I know the unit is correct but when I try to solve by my self I don't get that uint

please help ..

 

[AJ Bentley]

r = volume * pressure / temperature
= (length*length*length)/mass * Newtons/(length*length) / temperature
= length*Newtons/(temperature * mass)

= Joules/(temperature * mass)

 

[Borek]

Hi sir .. I know the unit is correct but when I try to solve by my self I don't get that uint

Show what you did then and we will try to find out where did you get wrong.

 

[Chestermiller]

1 Joule = 1 N-m

 

[Borek]

1 Joule = 1 N-m

Dash that looks like a minus is not the luckiest selection of the symbol in this context.

1 Joule = 1 Newton * m

is much less ambiguous.