The phrase "a difference of approximately" is correct and usable in written English.
It can be used when discussing measurements, quantities, or comparisons that are not exact but are close enough to provide a general idea.
Example: "There is a difference of approximately five miles between the two cities."
Alternatives: "an approximate difference of" or "a roughly estimated difference of".
That is a difference of approximately £70.
Comparative analysis has shown a difference of approximately 15% in material use when comparing cargo containers with the highest and lowest impacts.
Strikingly, a very small difference in the chemical structure between ethylene glycol and diethylene glycol in the silver nanoparticle-based ink, which is used to print drain-source electrodes in the SWNT-TFTs, with everything else identical, induced a difference of approximately 70 meV in the barrier height between the drain-source electrodes and the SWNT layer at 300 K.
A difference of approximately 11 kΩ existed in the sample with and without UV irradiation.
A difference of approximately 2 dB between these two cases was estimated.
Wood density on the SW aspect was lower than on the NE with a difference of approximately 0.006 g/cm3.
It is possible to notice a difference of 10percentt, approximately, between the Tg values measured by DSC and DMA for each of the ARC 858 samples and Belzona 1111.
Also, the reproducibility and reliability of electronic nose data was evaluated by repeating the analysis of samples in a different laboratory and with a time difference of approximately 11 months.
At a temperature difference of approximately 150 °C, the unit achieved a power output of 2.4 W.
The two methods were compared using scatter plot, regression analysis and a Bland-Altman plot [ 38], Figure 2. The Bland-Altman plot shows a random distribution around the mean with a proportional difference of approximately 14% on average with higher levels reported by the TRIFMA assay.
Discriminating thresholds for this task are in the magnitude of a semitone for listeners without musical training which corresponds to a frequency difference of approximately 6%[69]].
