# 13

## 13

1.667

**How do you calculate CP?**

Cp is an index used to assess the width of the process spread in comparison to the width of the specification. It is calculated by dividing the allowable spread by the actual spread. The allowable spread is the difference between the upper and lower specification limits.

### What does a CP of 2 mean?

Cp: A Tale of Two Tails Higher Cp values indicate a more capable process. When the specification spread is considerably greater than the process spread, Cp is high. When the specification spread is less than the process spread, Cp is low.

**What is CP and CPK?**

Cp and Cpk, commonly referred to as process capability indices, are used to define the ability of a process to produce a product that meets requirements.

#### What is CP equal to?

Cp is an amount of heat required to raise temperatire of an unit mass (1kg) by 1 degree Celsius when the system is at constant pressure. And Cv is an amount of heat required to raise the temperature of a unit mass by 1 degree Celsius when the volume of the system is constant.

**How do you calculate ideal gas CP?**

The specific heat at constant pressure for an ideal gas is given as (∂H∂T)V=cp=cv+R ( ∂ H ∂ T ) V = c p = c v + R .