The phrase "a size less than" is correct and usable in written English.
It can be used when specifying a measurement or quantity that is smaller than a given reference size.
Example: "Please select a size less than the one you usually wear for a better fit."
Alternatives: "a smaller size than" or "a size below".
mass fraction of particles after impact having a size less than that before impact, increased from ∼2.3 wt% (fresh particles) to 98 wt% after the 10th cycle.
Mesomorphic equi-axed domains with a size less than 20 nm were obtained by fast cooling from the melt at a rate larger about 100 K s−1.
Most carcinoid tumors of the rectum are confined to the submucosa with a size less than 1 2 cm and are usually suitable for local excision, as metastasis to the regional nodes is limited.
The slit increased the radial motion of the gas flow and improved the ability of the jacket to capture finer submicron particles with a size less than 1 μm.
The following warm rolling at an initial temperature of 673 K results in a uniform microstructure comprising β phase with a size less than ∼200 nm and the precipitation of nanosized α phase.
When the flow channel has a size less than the effective pore throat, capillary force to two-phase interfaces takes effect, and the resistance to two-phase flows increases suddenly.
Nevertheless, a variance of power exponent 0.27 is obtained by subdividing a landslide dataset with a sample size less than 600.
The samples were first subjected to a characterization process where a sieve was used to insure a uniform size, less than 3 mm for the biochar and less than 2 mm for the loamy sand.
The prepared NPs were rounded with a smooth surface and had a particle size less than 250 nm with narrow distribution and high entrapment efficiency (>80%).
Local sodium bentonite with a mesh size of 200 and a particles size less than 75 µm was used in this study.
Photosynthetic picoeukaryotes (PPE) with a cell size less than 3 µm play a critical role in oceanic primary production.
