Mass flow rate is a fundamental parameter in process engineering, representing the mass of a substance passing through a specific cross-section per unit of time. The units \(kg/s\) and \(kg/h\) are standard measures used to quantify this flow.
Kilogram per second (kg/s): This is the SI derived unit for mass flow rate. It is typically used in high-velocity systems, such as jet engine intake or large-scale industrial steam turbines, where instantaneous flow monitoring is critical.
Kilogram per hour (kg/h): This unit is more common in chemical processing, HVAC systems, and industrial manufacturing. It provides a convenient scale for hourly production quotas, batch processing, and long-term material balance calculations.
To convert between these units, we utilize the relationship between time intervals: since there are 3,600 seconds in one hour, the conversion factor is defined as \(1 \text{ kg/s} = 3600 \text{ kg/h}\).
Kilogram per second to Kilogram per hour Conversion Reference Table
Kilogram per second (kg/s)
Kilogram per hour (kg/h)
0.1
360
0.5
1800
1.0
3600
2.0
7200
5.0
18000
10.0
36000
20.0
72000
50.0
180000
100.0
360000
500.0
1.8000e+06
1000.0
3.6000e+06
Conversion Example: 10 kg/s to kg/h
To convert a mass flow rate from kilograms per second to kilograms per hour, multiply the value by 3,600. Follow these steps:
Identify the flow rate in kg/s: \(10 \text{ kg/s}\).
The factor 3600 is derived from the number of seconds in an hour. Since 1 minute equals 60 seconds and 1 hour equals 60 minutes, 60 multiplied by 60 equals 3600 seconds per hour.
Use kg/s for high-speed, transient, or dynamic systems where real-time control is required. Use kg/h for steady-state industrial processes, inventory management, and reporting production throughput.
"On fait la science avec des faits, comme on fait une maison avec des pierres ; mais une accumulation de faits n'est pas plus une science qu'un tas de pierres n'est une maison." "Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house." — Henri Poincaré (French Mathematician, Theoretical Physicist & Mining Engineer)