Which among the following is (are) the unit ofpressure?P R A C T I C E Q U E S T I O N SMeasurements 1.9(a) N m–2 (b) gwt cm–2(c) kgwt m–2 (d) All the above

To determine the unit of pressure among the options provided, we need to analyze each option individually.

(a) N m–2: This unit represents Newton per square meter, which is the SI unit of pressure known as Pascal (Pa). Therefore, option (a) is a unit of pressure.

(b) gwt cm–2: This unit represents grams weight per square centimeter. Although it includes the concept of weight, it is not a commonly used unit of pressure. Therefore, option (b) is not a unit of pressure.

(c) kgwt m–2: This unit represents kilograms weight per square meter. Similar to option (b), it includes the concept of weight but is not a commonly used unit of pressure. Therefore, option (c) is not a unit of pressure.

(d) All the above: Since option (a) is the only unit of pressure among the given options, option (d) is incorrect.

In conclusion, the correct unit of pressure among the given options is (a) N m–2.