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keyword

quantum theory definition

Monthly search volume and cost-per-click data for "quantum theory definition" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=quantum+theory+definition&country=us" +--------------+------------------+ | volume | 9,900 | | cpc | $6.54 | | competition | 0.02 | | country | US | | updated | 2026-06-13 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword volume cpc overlap
what is quantum mechanics 18,100 $6.34 18/20
what is quantum physics 18,100 $2.88 17/20
define quantum theory 9,900 $8.61 20/20
quantum physics definition 9,900 $4.05 20/20
quantum mechanics definition 9,900 $6.54 19/20
definition of quantum physics 9,900 $2 17/20
quantum theory 8,100 $4.12 20/20
what is the quantum theory 2,900 $2 20/20
what is quantum theory 1,300 $7.83 20/20
the quantum theory 1,300 $1.52 19/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://app.seodata.dev/v1/keyword?q=quantum+theory+definition&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt