The phrase "an approximate amount of" is correct and usable in written English.
You can use the phrase to refer to an amount that is not exact, but that is roughly what is expected or needed. Example: "We need an approximate amount of two cups of sugar for the recipe."
The courses line-out an approximate amount of hours they will take each week, as well as the duration of the course.
The TGA curves of the functionalized nanoparticles are shown in Figure 6, from which an approximate amount of functional groups on the silica surface could be confirmed.
The above mentioned works result in delivering an approximate amount of 1 GBq of 86Y labeled tracer which, in conjunction with 90Y therapy agents, could satisfy the need for a few patients.
In the highest concentration used in our experiments, an approximate amount of 50 mg (5.6 10−4 mol) of Y was added per pot by irrigation to the soil, from which only a fraction can be expected to be taken up.
Having provided the Ministry of Health with an approximate amount of US$350,0000, UNICEF represents the main financial and operational supporter of the current campaign.
We estimated an approximate amount of 40 staff hours for the development, testing and revision of one scenario and the corresponding score sheet as opposed to three hours as allocated by Rosenfeld et al. [ 14].
The approximate amount of a determinate combination of chemical-adsorbed compounds is better given by the spatial concentration (SC) concept.
In addition to the formal practice variables we computed a variable to describe the approximate amount of informal mindfulness practice completed, focussing on mindfulness of routine activity (completed in weeks 1 and 2), unscheduled 'additional' breathing spaces (completed in weeks 4 7) and moments of mindfulness (weeks 1 7).
Analysis of CO2 in the breath provides an accurate correction factor for the approximate amount of alveolar breath (as opposed to whole breath) collected in the sample (Pleil and Lindstrom 1995b).
Even though every person needs a different amount of sleep, the approximate amount of hours you should aim for is seven to nine.[5] Having a sleep diary will help you establish the exact amount of hours you need, as you will find out how much sleep you need to feel refreshed and ready for the new day.
Individual travelers can get into the mix by going to one of several carbon-offset Web sites, like www.carbonoffsets.org or www.terrapass.com, and using an online "carbon calculator" to determine the approximate amount of carbon dioxide produced when they travel.
