The phrase "a practical size" is correct and usable in written English.
You can use it when describing an object or item that is appropriately sized for a specific purpose or function.
Example: "The backpack is designed to be a practical size for daily use, making it easy to carry without being cumbersome."
Alternatives: "a convenient size" or "an appropriate size".
But making graphene sheets of a practical size has proved problematic.
Now we are at the phase of developing an SPB of a practical size.
Furthermore, this device is of low manufacturing cost and has a practical size that renders it suitable for a broad range of applications.
Thereafter, to improve hydrogen production performance, a self-supporting planar electrolysis cell with a practical size (80 mm × 80 mm of electrolysis area) was fabricated.
Comparison of the two conditions showed that a passively safe, low-power, underground reactor operating at high initial core temperature could have a practical size of RB.
A parametric study conducted using the finite element model shows that the moment-capacity of a practical size joint can be up to 20% lower than that of the cold-formed steel sections being connected.
In contrast, the run times reported for NetMatcher were measured for road maps of a more practical size around 100,000 edges.
A safer more practical size is likely 1000 x 120 pixels.
A sample of two hundred households was selected, without a formal sample size calculation, as a practical sample size that would yield useful information.
Mäki, A., Rissanen, J. A. & Tiirola, M. A practical method for barcoding and size-trimming PCR templates for amplicon sequencing.
Main contributions of this research include (1) proposing cost-effective time-dependent dynamic modeling methodology to measure the dimensions and check dimensional changes on a moving object of practical size, by integrating photogrammetry and robotic total station based survey techniques.
