The phrase "affected by the quantity" is correct and usable in written English.
It can be used when discussing how a certain quantity influences or impacts a situation, object, or outcome.
Example: "The final price of the product is affected by the quantity purchased, with discounts applied for bulk orders."
Alternatives: "influenced by the amount" or "determined by the quantity".
Conversion yields for all the 3 biodiesels were significantly affected by the quantity of added water.
The physical and chemical properties of bitumen are the determining factors for its use, and are affected by the quantity and quality of its ingredients and the process of refining hydrocarbons.
The typical climate conditions of Xi'an in 2005 were taken for discussion, and the results showed that the system performance is mainly affected by the quantity of solar radiation energy.
The way people eat is fundamentally affected by the quantity and nutritional quality of processed food available -- and how it is marketed, priced and distributed.
Male reproductive success can be strongly affected by the quantity or quality of sperm produced, especially in promiscuous mating systems with high levels of sperm competition.
The generation of accurate DNA profiles is directly affected by the quantity and quality of the samples received at the laboratory.
Illumina library bias and complexity is well known to be affected by the quality and quantity of the input DNA (Ross et al. 2013).
The insertion torque value in this study showed broader (10 to 50 N cm) than the previous publication (Table 2) [22, 32], and the cause of reasons for the difference are as follows: Primary stability may be affected by the bone quantity and bone quality in the treatment area, the micro- and macro-level design of the implant body, and the accuracy of the surgical technique [18, 25].
Although the presence of more pores in Copal cement seems beneficial to antibiotic release, the mechanical strength of this bone cement is negatively affected by the higher quantities of antibiotics.
The viscoelastic properties of dough, which are mainly affected by the strength and quantity of gluten, determine its suitability for being processed into different types of food products [1].
This type of care may be considered to be directly affected by the presence and quantity of resources available, and is distinct from individual physicians' skill or experience.
