Lb/f to kn/m and not consistent

[violt]

I'm trying to convert lb/f to kn/m.
A concrete has weight of 23.54 kiloNewton/cubic meter which is equal to 150 pounds per cubic feet.

For a beam with the following dimensions
width = 0.3m = 0.84 feet
depth = 0.5m = 1.9685 feet

for the beam weight per meter in metric, it is 23.54*0.3*0.5=3.531 kn/m
for the beam weight per foot in english, it is 150*0.98*1.96=290.62 lb/foot

But if I convert 290.62 lb/foot to kn/m. I don't get 3.531kn/m but 4.240181 kn/m
here's the calculation

290.62 lb/f * 3.28 f/m * 1kn/224.8lb = 4.24 kn/m

why not 3.531 kn/m??

Note this is not a homework. Thanks.

 

[scurty]

I didn't check the calculation, but I noticed you wrote 0.84 feet for the width but used 0.98 feet in a calculation a few lines down. Maybe that is where the error lies?

 

[SteamKing]

I don't know where you got your meter and feet conversions from, but they are in error.

1 meter = 39.37 in. = 3.2808 ft.

1 foot = .305 m

 

[violt]

i got the error. It's formula in my excel which uses 0.6m instead of 0.5m. Anyway, thanks

 

[CellCoree]

I can understand your confusion and frustration with the inconsistency in the conversion between lb/f and kn/m. This is likely due to rounding errors and conversion factors used in the calculations. It is important to note that converting between different units can sometimes result in slightly different values due to the use of different conversion factors and precision in calculations. In this case, the difference between 3.531 kn/m and 4.24 kn/m may be due to the use of different conversion factors for lb/f to kn/m. It is always important to double check your calculations and use the most accurate conversion factors available. Additionally, it may be helpful to consult with a conversion chart or use an online unit converter to ensure accuracy in your conversions.