seodata.dev

keyword

define quantum theory

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

$ curl "https://app.seodata.dev/v1/keyword?q=define+quantum+theory&country=us" +--------------+------------------+ | volume | 9,900 | | cpc | $8.61 | | competition | 0 | | country | US | | updated | 2026-06-08 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword volume cpc overlap
quantum physicists 60,500 $4.57 16/20
what is the quantum theory 18,100 $2.88 20/20
what are quantum physics 18,100 $4.21 16/20
definition of quantum physics 9,900 $6.54 20/20
quantum physics definition 9,900 $4.05 20/20
quantum theory definition 9,900 $6.54 20/20
quantum theory 8,100 $3.98 16/20
what is the definition of quantum theory 1,600 $3.49 15/20
what is quantum theory 1,300 $7.83 20/20
the quantum theory 480 $0 20/20

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=define+quantum+theory&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