Which of the following options is correctly matched?

Units of pressure - Pascal, Bar and Torr

The correct answer is option 3. Units of pressure - Pascal, Bar and Torr.

Let's explain each of the options:

1. Units of force - Joule, Horsepower, Torr:

Joule (J) is the unit of energy or work in the International System of Units (SI). It is not a unit of force; instead, it measures the amount of energy transferred or converted.

Horsepower (hp) is a unit of power, not force. It measures the rate at which work is done or energy is transferred.

Torr (mmHg) is a unit of pressure, not force. It is commonly used to measure the pressure exerted by a fluid, particularly in applications related to gases.

2. Units of work done - Newton, Pascal, Bar:

Newton (N) is the unit of force in the International System of Units (SI). It measures the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.

Pascal (Pa) is the unit of pressure, not work. It measures pressure, defined as force per unit area.

Bar (bar) is also a unit of pressure, not work. It is commonly used in meteorology and other fields to measure atmospheric pressure.

3. Units of pressure - Pascal, Bar and Torr:

Pascal (Pa) is the SI unit of pressure. It is defined as one newton per square meter.

Bar (bar) is a unit of pressure commonly used in various applications, including meteorology, industrial settings, and automotive engineering.

Torr (mmHg) is another unit of pressure, often used in contexts related to vacuum systems and gas pressure measurements, especially in chemistry and physics laboratories.

4. Units of volume - Kilogram, Gram, Metre:

Kilogram (kg) and gram (g) are units of mass, not volume. They measure the amount of matter in an object.

Metre (m) is a unit of length or distance, not volume. It is commonly used to measure the size or extent of an object in one dimension.

Therefore, the only correctly matched option is: Units of pressure - Pascal, Bar and Torr