The lb (Pound) is a unit of mass (sometimes called weight) and the psi (pounds per square inch) is a unit of pressure. I take it that you need to calculate the pressure of a number of pounds on a certain surface. You may find the suggested web site helpful. You can't convert pounds to pounds per square inch (psi). One is force and one is pressure. If you know the area over which the force is spread, then you can divide the force by the area and get pounds per square inch (psi).
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To convert pounds (lbs) to pounds per square inch (psi), you need to know the area over which the force is applied. Without this information, you cannot directly convert pounds to psi. Psi is a unit of pressure, while pounds is a unit of force. If you know the area in square inches over which the 200 lbs force is applied, you can divide the force by the area to get the pressure in psi.
psi of pressure = (200 lbs) divided by (the area that supports the 200 lbs, in inches)
Multiply psi x 0.07 to get atmospheres.
200lbs
No, It is not possible as they measure different things. Pounds is a measurement of force and psi is a measurement of pressure. This problem is similar to asking if feet can be converted to gallons.
yes
1 ATM = 101325 Pascals 1 Pascal = 1/101325 ATM