"existing matter" is correct and usable in written English.
You can use it when you are referring to a physical material that already exists, such as in the sentence, "The existing matter was studied in detail."
Here, we propose that the three ubiquitous and paramount attributes of all existing matter charge (Q), spin (S) or rotational motion, and linear motion (K) can be used to account for the formation of different types of matter/materials and their properties that have been or will be known to us.
Matter, in Smith's view, could neither be created nor destroyed; the creation involved only the reorganization of existing matter.
They argue that the new finance minister, Ngozi Okonjo-Iweala, a former managing director at the World Bank, who was sworn in this August, needs time to learn all about existing matters.
Although the coverage of the present statute is very broad, and would be broadened further by the explicit recognition of all forms of choreography, there are unquestionably other areas of existing subject matter that this bill does not propose to protect but that future Congresses may want to.
We discuss the implication of the non-detection of the 3.55 keV line at galactic scale dark matter halo to existing dark matter models.
This is inherent to the method: Although the probabilistic tractography will 'follow' the existing white matter tracts (see also Jbabdi et al. 2013), it does not represent an absolute measure of white matter volume (for further details see Johansen-Berg and Behrens 2009).
To identify better tracer leads, we started off by mining the data for existing chemical matter, prioritized by the CNS PET design parameters.
As the result, the complete coincidence of the distribution of hardness salt and existing organic matter concentrations according to the fractions was observed (Fig. 1).
