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Can I use a ft-lb wrench for in-lb specs?

Only if the conversion falls within the reliable range of the wrench. Usually, ft-lb wrenches are not accurate below 10-20 ft-lbs (120-240 in-lbs).

Price conversion?

$/Bu to $/Tonne? Multiply $/Bu by the number of bushels in a tonne (~39.3 for Corn).

Why not calculate circle area normal way?

You can, but measuring diameter in feet is annoying (0.83 ft). Measuring in inches (10 in) is easier. The 0.005454 constant handles the Inch-to-Foot conversion squared.

Why 0.0821 R?

Because Kp is typically defined with partial pressures in atmospheres (atm) and Kc in Molarity (mol/L). The units of conversion require L·atm/mol·K.

PPM conversion?

1 Mass Percent = 10,000 PPM (w/w).

Does Path Length matter?

Not for conversion between A and T. But it matters for Beer's Law (A to Concentration).

Acre conversion?

1 Acre is approximately 4,047 square meters.

Hectare conversion?

1 Hectare is exactly 10,000 square meters (100m x 100m).

How many gallons in 1 sq ft 1 inch deep?

0.623 gallons. This is the standard conversion factor used for rainfall calculations.

Price conversion?

If you see a price in Sq Ft and want to compare it to Sq Yd, just multiply the Sq Ft price by 9.